{"title":"Keystone Formula","description":"\u003cdiv style=\"text-align: center;\"\u003e\n\u003cdiv style=\"display: inline-block; max-width: 900px; text-align: left;\"\u003eFountain pen ink manufactured at our workshop, Keystone Formula inks are built with traditional water-soluble dye colorants to produce a broad spectrum of hues.\u003c\/div\u003e\n\u003c\/div\u003e","products":[{"product_id":"flint","title":"Flint","description":"\u003cp\u003eOur Flint fountain pen ink was formerly titled \"Gunpowder\", but has been renamed to avoid misclassification flags on search engines and social media. \u003c\/p\u003e\n\u003cp\u003eFlint is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. The 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw. \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eWe manufacture this ink in Pennsylvania with domestic and imported ingredients. \u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eEach glass ink bottle arrives in a beautiful copper-foiled paper gift box, individually wrapped in reusable cellulose wadding for cushioned protection.\u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":47715369222386,"sku":"PN100497","price":17.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Flint_cc4b6b96-6881-4654-ba69-8e06a269505f.jpg?v=1786376127"},{"product_id":"boiler-steam","title":"Boiler Steam","description":"\u003cp style=\"text-align: right;\"\u003eMove the iron horse.\u003c\/p\u003e\n\u003cp\u003eBoiler Steam is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. \u003cspan\u003eThe 50mL volume will provide approximately 62 standard converter refills assuming a 0.8mL draw.\u003c\/span\u003e\u003cspan\u003e Our ink swatch is produced with a cotton swab on Tomoe River paper.\u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"50mL Glass Bottle","offer_id":47365916852466,"sku":"PN100533","price":17.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Boiler_Steam_4eea0ace-f3f7-4e48-96b7-c7ce0af2436f.jpg?v=1750435394"},{"product_id":"tesla-coil","title":"Tesla Coil","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eOne of our most popular inks, Tesla Coil is a rich cobalt blue color that will produce an iridescent magenta sheening effect when saturated on high-quality papers like Tomoe River and Rhodia. The pictured writing sample is made on 68 gsm Tomoe River paper with a cotton swab and medium nib. \u003cstrong\u003eThis colorant will produce a pure cobalt blue on sorbent papers.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cem\u003e*Fountain pen ink sheen properties are best expressed when the ink is saturated on slightly hydrophobic papers like Tomoe River or \u003cmeta charset=\"utf-8\"\u003eMidori MD. Get the best results with a wet line. \u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eVisible coloring will vary drastically by paper type and saturation\u003c\/strong\u003e.\u003c\/em\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eTesla Coil is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. \u003cspan\u003eThe 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw.\u003c\/span\u003e\u003cspan\u003e \u003cmeta charset=\"utf-8\"\u003eWe manufacture this ink in Pennsylvania with domestic and imported ingredients.\u003c\/span\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":49287870611698,"sku":"PN100162","price":25.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Tesla_Coil_d50f27cb-75ea-457b-8e89-73c21477bb3a.jpg?v=1785418262"},{"product_id":"voltaic-arc","title":"Voltaic Arc","description":"\u003cp\u003e\u003cspan\u003eVoltaic is a vivid dark blue to blue-black that sparks with a rich merlot sheen in saturation for an alternating current of a finish.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003cem\u003e*Fountain pen ink sheen properties are best expressed when the ink is saturated on slightly hydrophobic papers like Tomoe River or \u003cspan\u003eMidori MD\u003c\/span\u003e. Get the best results with a wet line.  \u003cstrong\u003eVisible coloring will vary drastically by paper type and saturation.\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePart of the Keystone Formula fountain pen ink line, Voltaic Arc is built with \u003cmeta charset=\"utf-8\"\u003etraditional water-soluble dye colorants. Our ink color swatch is produced with a cotton swab on Tomoe River paper and writing sample with a German medium nib. \u003c\/span\u003e\u003cspan\u003eThe 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw. G\u003c\/span\u003elass bottles arrive prepared in our beautifully foiled Birmingham Pen Co. gift box.\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":47365916721394,"sku":"PN100165","price":19.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Voltaic_Arc_de0e44e9-3b0e-4fc6-b0e9-6145da25344c.jpg?v=1786110119"},{"product_id":"jade-inferno","title":"Jade Inferno","description":"\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eJade Inferno is a radiant teal that smolders with hints of merlot sheen* in saturation for a subtly molten finish.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003cem\u003e*While it's possible to find sheen in the Jade Inferno when saturated on slightly hydrophobic papers like Tomoe River or \u003cmeta charset=\"utf-8\"\u003e\n\u003cspan\u003eMidori MD\u003c\/span\u003e, this property may require a wet pen and broad nib to achieve in writing. \u003c\/em\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003e\u003cspan\u003ePart of the Keystone Formula fountain pen ink line, \u003cmeta charset=\"utf-8\"\u003eJade Inferno is built with traditional dye-colorants. \u003cmeta charset=\"utf-8\"\u003eOur ink color swatch is produced with a cotton swab on Tomoe River paper. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003e\u003cspan\u003eThe 50mL volume will provide approximately 62 standard converter refills assuming a 0.8mL draw. G\u003c\/span\u003elass bottles arrive prepared in our beautifully foiled Birmingham Pen Co. gift box.\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"50mL Glass Bottle","offer_id":47877227544818,"sku":"PN100168","price":17.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Jade_Inferno_50.jpg?v=1756229680"},{"product_id":"hibiscus","title":"Hibiscus","description":"\u003cp\u003eHibiscus is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. The 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw. \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eWe manufacture the \u003cmeta charset=\"utf-8\"\u003eHibiscus writing ink in Pennsylvania with domestic and imported ingredients.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEach glass ink bottle arrives in a beautiful copper-foiled paper gift box, individually wrapped in reusable cellulose wadding for cushioned protection.\u003c\/span\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":47365916655858,"sku":"PN100182","price":17.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Hibiscus_2091e9ea-0fcc-4dbb-a4c7-fa7483571cf2.jpg?v=1785941542"},{"product_id":"ohio-river","title":"Ohio River","description":"\u003cp\u003e\u003cem\u003eThe Ohio starts at the point.\u003c\/em\u003e \u003cmeta charset=\"utf-8\"\u003eOhio River is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. The 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw.\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eWe manufacture Ohio River in Pennsylvania with domestic and imported ingredients.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEach glass ink bottle arrives in a beautiful copper-foiled paper gift box, individually wrapped in reusable cellulose wadding for cushioned protection.\u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"50mL Glass Bottle","offer_id":47365916557554,"sku":"PN100200","price":17.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Ohio_River.jpg?v=1774542380"},{"product_id":"horseradish-mustard","title":"Horseradish Mustard","description":"\u003cp\u003eHorseradish Mustard is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant writing ink. The 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw. \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eWe manufacture Horseradish Mustard in Pennsylvania with domestic and imported ingredients.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEach glass ink bottle arrives in a beautiful copper-foiled paper gift box, individually wrapped in reusable cellulose wadding for cushioned protection.\u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL","offer_id":49962185490674,"sku":"PN100299","price":17.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Horseradish_Mustard_a032da28-d676-4113-b0d3-8aa9f14917a6.jpg?v=1787772520"},{"product_id":"angelfish","title":"Angelfish","description":"\u003cp\u003e\u003cspan\u003eAngelfish is a vivid oceanic blue that glows with merlot sheen in saturation on slightly hydrophobic fountain pen friendly papers.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eTo achieve the secondary merlot color sheening property in \u003cmeta charset=\"utf-8\"\u003eAngelfish, it generally requires a well saturated stroke on fountain pen friendly paper. \u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePart of the Keystone Formula fountain pen ink line, \u003cmeta charset=\"utf-8\"\u003eAngelfish is built with traditional dye-colorants. Our ink color swatch and writing samples are produced on Tomoe River paper with a cotton swab and medium point grade nib. \u003c\/span\u003e\u003cspan\u003eThe 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw. G\u003c\/span\u003elass bottles arrive prepared in our beautifully foiled Birmingham Pen Co. gift box. \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eWe manufacture this ink in Pennsylvania with domestic and imported ingredients.\u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":47901462528242,"sku":"PN100335","price":19.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Angelfish_b7b307dc-10bb-401f-9c37-a63dc5a91ad7.jpg?v=1786376228"},{"product_id":"heron","title":"Heron","description":"\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eGET ONE\u003cspan\u003e \u003c\/span\u003e\u003cspan style=\"color: rgb(231, 0, 0);\"\u003eFREE\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e bottle with Heron in the \u003ca title=\"Tiger's Eye Ink Bundle\" href=\"https:\/\/www.birminghampens.mom\/products\/tigers-eye-bundle\"\u003e\u003cstrong\u003e\u003cspan style=\"color: rgb(90, 49, 244);\"\u003eTiger's Eye Ink Bundle\u003c\/span\u003e\u003c\/strong\u003e\u003c\/a\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eHeron is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. \u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eThe 45mL volume will provide approximately 62 standard converter refills assuming a 0.8mL draw.\u003c\/span\u003e\u003cspan\u003e Our ink swatch is produced with a cotton swab on Tomoe River paper. \u003cmeta charset=\"utf-8\"\u003eWe manufacture this ink in Pennsylvania with domestic and imported ingredients.\u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":48251173175538,"sku":"PN100463","price":17.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Heron_c963b507-1f5e-4bef-b71c-e18d8c0bed84.jpg?v=1785505798"},{"product_id":"emerald-fusion","title":"Emerald Fusion","description":"\u003cp style=\"text-align: right;\"\u003e\u003cem\u003eGo nuclear. \u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eEmerald Fusion is packed with colorant and will produce a striking green sheen on common fountain pen friendly papers. This highly saturated hue may write on the dry side in some pens - get the best performance in a well flowing writer equipped with a medium point grade nib or broader. Part of our \u003cmeta charset=\"utf-8\"\u003etraditional dye-colorant Keystone Formula ink line, t\u003cspan\u003ehe 45mL minimum volume will provide approximately 56 standard converter refills assuming a 0.8mL draw. \u003c\/span\u003e\u003cspan\u003eOur ink swatch is produced with a cotton swab on Tomoe River paper. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003ePrepare for an INTENSE green sheen on fountain-pen-friendly papers like Tomoe River and \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eMidori MD\u003c\/span\u003e. \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eWe manufacture this ink in Pennsylvania with domestic and imported ingredients.\u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":47365915738354,"sku":"PN100639","price":25.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Emerald_Fusion_01702b0c-9b2d-49c4-8f9a-f2cf10aec52a.jpg?v=1785418182"},{"product_id":"quantum-teal","title":"Quantum Teal","description":"\u003cp\u003e\u003cspan\u003eEngineered for chromatic complexity, Quantum Teal writes with an ultra saturated, rich teal base that dries with a metallic violet sheen on quality writing papers. \u003cem\u003e\u003cstrong\u003eThe color shifts dark teal with dryer strokes and on sorbent papers. \u003c\/strong\u003e\u003c\/em\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eQuantum Teal is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. \u003cspan\u003eThe 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw.\u003c\/span\u003e\u003cspan\u003e Our ink swatch is produced with a cotton swab on Tomoe River paper.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eThis ink will produce a sheening effect on high-quality papers like Tomoe River and Midori MD. Our writing sample in this listing was made on 68 gsm Tomoe River paper.\u003c\/span\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":47365915279602,"sku":"PN100640","price":25.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Quantum_Teal_8d0aff60-1ef3-4a79-b877-93501cc18ce8.jpg?v=1785330996"},{"product_id":"burlywood","title":"Burlywood","description":"\u003cp style=\"text-align: left;\"\u003eWith knots of character, Burlywood is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. \u003cspan\u003eThe 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw.\u003c\/span\u003e\u003cspan\u003e Our ink swatch is produced with a cotton swab on Tomoe River paper. We manufacture this ink in Pennsylvania with domestic and imported ingredients.\u003c\/span\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":47365915246834,"sku":"PN100641","price":17.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Burlywood_8d601412-beec-4caf-9977-6bfe4d4cbcf2.jpg?v=1785330964"},{"product_id":"streetcar","title":"Streetcar","description":"\u003cp\u003eStreetcar is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. \u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eThe 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw. Our ink swatch is produced with a cotton swab on Tomoe River paper. \u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":49867035902194,"sku":"PN100653","price":17.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Streetcar_517cc1ca-b762-4a9d-9005-8ff1d9fa0e81.jpg?v=1785506011"},{"product_id":"tiger-lily","title":"Tiger Lily","description":"\u003cp\u003eTiger Lily is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. The 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw. \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eWe manufacture Tiger Lily in Pennsylvania with domestic and imported ingredients.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEach glass ink bottle arrives in a beautiful copper-foiled paper gift box, individually wrapped in reusable cellulose wadding for cushioned protection.\u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":47346182193394,"sku":"PN100680","price":17.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Tiger_Lily_ecc85a32-192b-41b0-9d39-709974cdcb1f.jpg?v=1788532491"},{"product_id":"abandoned-shipyard","title":"Abandoned Shipyard","description":"\u003cp\u003eAbandoned Shipyard is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. The 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw. \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eWe manufacture Abandoned Shipyard in Pennsylvania with domestic and imported ingredients.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEach glass ink bottle arrives in a beautiful copper-foiled paper gift box, individually wrapped in reusable cellulose wadding for cushioned protection.\u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":49987794043122,"sku":"PN100688","price":17.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Abandoned_Shipyard_c2a6e297-b576-4703-9300-3ce696b9852b.jpg?v=1787929117"},{"product_id":"aqueduct","title":"Aqueduct","description":"\u003cp style=\"text-align: center;\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eGET ONE\u003cspan\u003e \u003c\/span\u003e\u003cspan style=\"color: rgb(231, 0, 0);\"\u003eFREE\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e bottle with Aqueduct in the \u003ca href=\"https:\/\/www.birminghampens.mom\/products\/firebox-ink-bundle\" title=\"Angelfish\"\u003e\u003cstrong\u003e\u003cspan style=\"color: rgb(90, 49, 244);\"\u003eFirebox Ink Bundle\u003c\/span\u003e\u003c\/strong\u003e\u003c\/a\u003e. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eAqueduct is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. The 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw. \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eWe manufacture this ink in Pennsylvania with domestic and imported ingredients.\u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":47678538645746,"sku":"PN100690","price":17.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Aqueduct_e3316d6c-f336-4b7c-926d-2b9b1c1ec1f1.jpg?v=1785851424"},{"product_id":"butchers-broom","title":"Butcher's Broom","description":"\u003cp\u003eButcher's Broom is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. \u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eThe 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw.\u003c\/span\u003e\u003cspan\u003e Our ink swatch is produced with a cotton swab on Tomoe River paper. \u003cmeta charset=\"utf-8\"\u003eWe manufacture this ink in Pennsylvania with domestic and imported ingredients.\u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":47502449246450,"sku":"PN100691","price":17.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Butchers_Broom_35c11ed7-ac6d-4478-875a-ab4a3126722d.jpg?v=1763148925"},{"product_id":"iron-ore","title":"Iron Ore","description":"\u003cp style=\"text-align: center;\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eGET ONE\u003cspan\u003e \u003c\/span\u003e\u003cspan style=\"color: rgb(231, 0, 0);\"\u003eFREE\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e bottle with Iron Ore in the \u003ca title=\"Angelfish\" href=\"https:\/\/www.birminghampens.mom\/products\/firebox-ink-bundle\"\u003e\u003cstrong\u003e\u003cspan style=\"color: rgb(90, 49, 244);\"\u003eFirebox Ink Bundle\u003c\/span\u003e\u003c\/strong\u003e\u003c\/a\u003e. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eIron Ore is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. \u003cspan\u003eThe 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw.\u003c\/span\u003e\u003cspan\u003e Our ink swatch is produced with a cotton swab on Tomoe River paper. \u003cmeta charset=\"utf-8\"\u003eWe manufacture this ink in Pennsylvania with domestic and imported ingredients.\u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":47365913837810,"sku":"PN100874","price":17.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Iron_ore_0968f866-41fa-4fff-bbb2-b9c723f02f47.jpg?v=1785851635"},{"product_id":"interstellar-bronze","title":"Interstellar Bronze","description":"\u003cp\u003eBending spacetime and testing the limits of rich colorant saturation, Interstellar Bronze is a mesmerizing fusion of cosmic curiosity. This ultra-saturated hue shows a rich bronze-brown base that's overwhelmed with galactic fluorescent green sheen on slightly hydrophobic fountain-pen-friendly papers. Curiously purple-hued in the bottle, \u003cmeta charset=\"utf-8\"\u003eInterstellar Bronze is part of our traditional dye-colorant Keystone Formula writing ink series.\u003c\/p\u003e\n\u003cp\u003eSince this is an extremely saturated ink, some pens may operate on the dry side. Frequent pen cleaning is suggested and could require extra effort, but the dye colorants are entirely water-soluble. \u003cmeta charset=\"utf-8\"\u003eThis supersaturated hue performs best with broad point-grade nibs or thicker. \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003ePhotographed color swatch was produced with cotton swab on Tomoe River paper. \u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003cp\u003eFeatured writing ink is designed for a fountain pen paired with common quality writing papers. \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eThe 45mL volume delivers approximately 56 standard converter refills with a 0.8mL draw.\u003c\/span\u003e\u003cspan\u003e We manufacture this product in Pennsylvania with domestic and imported ingredients.\u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":47365908955378,"sku":"PN100707","price":25.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Interstellar_Bronze_5f4a3b3b-1520-49e1-befc-ddeea135dc83.jpg?v=1785249651"},{"product_id":"firebox","title":"Firebox","description":"\u003cp style=\"text-align: center;\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eGET ONE\u003cspan\u003e \u003c\/span\u003e\u003cspan style=\"color: rgb(231, 0, 0);\"\u003eFREE\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e bottle with Firebox in the \u003ca href=\"https:\/\/www.birminghampens.mom\/products\/firebox-ink-bundle\" title=\"Angelfish\"\u003e\u003cstrong\u003e\u003cspan style=\"color: rgb(90, 49, 244);\"\u003eFirebox Ink Bundle\u003c\/span\u003e\u003c\/strong\u003e\u003c\/a\u003e. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eFirebox is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. \u003cspan\u003eThe 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw.\u003c\/span\u003e\u003cspan\u003e Our ink swatch is produced with a cotton swab on Tomoe River paper. \u003cmeta charset=\"utf-8\"\u003eWe manufacture this ink in Pennsylvania with domestic and imported ingredients.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":47347669205234,"sku":"PN100708","price":17.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Firebox_03dfeb04-dea1-4f9b-a634-badd10f99557.jpg?v=1785851571"},{"product_id":"extradimensional-umber","title":"Extradimensional Umber","description":"\u003cp\u003eAn ultra-saturated quasi-sheening sepia, Extradimensional Umber bends the color wheel. With a robust sepia base and a hint of green sheen at the right angle, stretching to sandy caramel on a speedier stroke, this hue will surely be one of the most mind-bending in your collection. \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWARNING\u003c\/strong\u003e: Photographing the character in this ink is difficult. I've done my best to capture the extradimensional nuance, but you're bound to find something new as you play with stronger and weaker saturations on different papers in various lighting atmospheres. \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eOur ink swatch is produced with a cotton swab on Tomoe River paper. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eSince this is an extremely saturated ink, some pens may operate on the dry side and extra effort may be required in cleaning. Extradimensional Umber is part of the Keystone Formula fountain pen ink line, built with water soluble dye-colorants. \u003cspan\u003eThe 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":49288092975346,"sku":"PN100718","price":25.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Extradimensional_Umber_dd04398a-eb63-4f78-8194-2c285ed4d737.jpg?v=1786023372"},{"product_id":"blossomed-lotus","title":"Blossomed Lotus","description":"\u003cp\u003eBlossomed Lotus is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. The 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw. \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eWe manufacture \u003cmeta charset=\"utf-8\"\u003eBlossomed Lotus in Pennsylvania with domestic and imported ingredients.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEach glass bottle of writing ink arrives in a beautiful copper-foiled paper gift box, individually wrapped in reusable cellulose wadding for cushioned protection.\u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":47365908431090,"sku":"PN100725","price":17.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Blossomed_Lotus_3a787dcb-44c1-43ae-9604-798c2fb744db.jpg?v=1786376182"},{"product_id":"mountain-thistle","title":"Mountain Thistle","description":"\u003cp\u003eMountain Thistle is a soft highland heather with complexity in saturation on fountain pen friendly papers. Color shifts from a soft lavender at dusk to a muted violet.\u003c\/p\u003e\n\u003cp\u003eMountain Thistle is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. The 50mL volume will provide approximately 60 standard converter refills assuming a 0.8mL draw. \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eWe manufacture this ink in Pennsylvania with domestic and imported ingredients.\u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"50mL Glass Bottle","offer_id":49110852894962,"sku":"PN100727","price":17.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Mountain_Thistle_fbd4817b-e333-4c8a-af4c-1879662809e7.jpg?v=1774542350"},{"product_id":"saltmarsh","title":"Saltmarsh","description":"\u003cp\u003e\u003cspan data-sheets-userformat='{\"2\":33567427,\"3\":{\"1\":0},\"4\":{\"1\":2,\"2\":16777215},\"9\":1,\"10\":2,\"12\":0,\"15\":\"Roboto\",\"16\":12,\"28\":1}' data-sheets-value='{\"1\":2,\"2\":\"Saltmarsh\"}' data-sheets-root=\"1\"\u003eSaltmarsh is one unique hue! Depending on the type of light in proximity to the ink it can change from a marshy green all the way to a light coffee brown. In our experience the ink shifts to the coffee tone in daylight, and back to the green tone in most (\u003cem\u003ethough not all\u003c\/em\u003e) indoor lighting.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-sheets-userformat='{\"2\":33567427,\"3\":{\"1\":0},\"4\":{\"1\":2,\"2\":16777215},\"9\":1,\"10\":2,\"12\":0,\"15\":\"Roboto\",\"16\":12,\"28\":1}' data-sheets-value='{\"1\":2,\"2\":\"Saltmarsh\"}' data-sheets-root=\"1\"\u003eSaltmarsh\u003c\/span\u003e is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. \u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eThe 50mL volume will provide approximately 62 standard converter refills assuming a 0.8mL draw.\u003c\/span\u003e\u003cspan\u003e Our ink swatch is produced with a cotton swab on Tomoe River paper. \u003cmeta charset=\"utf-8\"\u003eWe manufacture this ink in Pennsylvania with domestic and imported ingredients.\u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"50mL Glass Bottle","offer_id":47483452424434,"sku":"PN100741","price":17.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Saltmarsh_25dfaf3a-ee95-4de0-860f-bfb45ed4719b.jpg?v=1774542409"},{"product_id":"sugar-kelp","title":"Sugar Kelp","description":"\u003cp\u003e\u003cspan\u003eDive deep with Sugar Kelp to discover a spectrum of nuanced organic complexities.  Varying by saturation and paper type, this hue can range from a lighter citron to a shaded olive. \u003cspan\u003eThe 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw.\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e Our ink swatch is produced with a cotton swab on Tomoe River paper. \u003cmeta charset=\"utf-8\"\u003eWe manufacture this ink in Pennsylvania with domestic and imported ingredients.\u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":47860381581554,"sku":"PN100744","price":17.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Sugar_Kelp_088ab16c-9e9b-4c76-8d7c-553131d7b01c.jpg?v=1774542434"},{"product_id":"bearing-grease","title":"Bearing Grease","description":"\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"UTF-8\"\u003eBearing Grease ink oozes on the page with the rich, ultra deep greens and blacks of worn-out bearing lubricant. This shade is built with a very saturated colorant recipe and is oddly produced with a super-concentration of green, red, and blue colorant. Use a medium point grade nib or broader for the best performance and prepare for the possibility of a bit of extra pen cleaning. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBearing Grease\u003c\/span\u003e is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. \u003cspan\u003eThe 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw.\u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":49833627484402,"sku":"PN100746","price":25.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Bearing_Grease_3807e5ff-0c8d-4100-94f6-ba1c6f87577b.jpg?v=1787071597"},{"product_id":"moon-jellyfish","title":"Moon Jellyfish","description":"\u003cp\u003eMoon Jellyfish is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. This hue will produce a subtle sheening effect when saturated on high-quality papers like Tomoe River and \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eMidori MD\u003c\/span\u003e. Our color swatch was made with a cotton swab on 68 gsm Tomoe River paper. Color will pull toward a rich blue with more sorbent papers.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw.\u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":47373625950450,"sku":"PN100864","price":19.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Moon_Jellyfish_d7409b0a-b748-4658-b518-677669811f4a.jpg?v=1786110055"},{"product_id":"black-pearl","title":"Black Pearl","description":"\u003cp\u003eBlack Pearl is an ultra-saturated quasi-sheener, boasting a rich black base that subtly reveals olive undertones at particular angles, then stretches toward a muted greenish-olive when applied in a thinner layer. Swatch is shown using a cotton swab on Tomoe River paper under photography lighting.\u003c\/p\u003e\n\u003cp\u003eThe extraordinarily high saturation of Black Pearl may make some pens run on the drier side. Adjust your writing experience by adding Dilution Solution until it meets your flow and shading preferences. Expect variation in hue as you dilute. \u003cspan\u003eWhile the dye colorant components of this color are completely water-soluble, regular pen cleaning is recommended and may require extra effort.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eFor best results, wield Black Pearl with a medium point grade or broader nib.\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":47477723234546,"sku":"PN100865","price":25.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Black_Pearl_946bcdfa-d3e6-4b18-b047-ee4ddbe7d0e5.jpg?v=1785418109"},{"product_id":"suncatcher","title":"Suncatcher","description":"\u003cp style=\"text-align: right;\"\u003eLight’s favorite souvenir.\u003c\/p\u003e\n\u003cp\u003eSuncatcher is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. \u003cspan\u003eThe 45mL volume will provide approximately 56 standard converter refills assuming a 0.8mL draw.\u003c\/span\u003e\u003cspan\u003e Our ink swatch is produced with a cotton swab on Tomoe River paper.\u003c\/span\u003e\u003c\/p\u003e","brand":"Fountain Pen Ink","offers":[{"title":"45mL Glass Bottle","offer_id":47443705528562,"sku":"PN100915","price":17.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1237\/1088\/files\/Suncatcher_6116b606-e495-4e16-bb85-622f3951d303.jpg?v=1774542458"}],"url":"https:\/\/www.birminghampens.mom\/collections\/keystone-formula-inks.oembed?page=4","provider":"Birmingham Pen Company","version":"1.0","type":"link"}