{"type":"firestarter.listing","listing":{"id":"lst_YrOJ_1FT","product_name":"Glasswing Butterfly Twinkle","category":"Ink Bottle","description":" SAVE on Glasswing Butterly Twinkle in the Twinkle Pair.\nGlasswing Butterfly Twinkle features a vivid sapphire base accented with iridescent magenta sheen* when saturated on fountain-pen-friendly papers. This hue is finished with a pearlescent golden Twinkle pigment, offering a remarkable range of visual variation—from light and medium sapphire tones with golden twinkle at lean saturations, to deep sapphire with intermittent merlot sheen and golden sparkle at rich saturations.*\n*Find sheen in the Glasswing Butterfly when saturated on common fountain-pen-friendly papers like Tomoe River or Rhodia. This property may require a wet pen and broad nib to achieve in writing. Our writing samples and swatch were made on Tomoe River paper with a medium point grade nib and cotton swab.\nTwinkle Formula inks require additional pen maintenance and cleaning compared to their traditional ink peers. A medium point grade nib or larger is suggested to permit the pigment to travel from reservoir to page. We do not recommend pigmented inks in vintage pens. With all pigmented inks, we suggest using a pen that fully disassembles for complete and thorough cleaning.\nEach 90mL volume will provide over 110 standard converter refills with an average 0.8mL draw. Rigid glass bottles arrive individually wrapped in cellulose wadding and prepared in a beautifully foiled gift box. We manufacture this ink in Pennsylvania with domestic and imported ingredients.","images":["https://cdn.shopify.com/s/files/1/1237/1088/files/Glasswing_Butterfly_Swatch_Macro.jpg?v=1769018858","https://cdn.shopify.com/s/files/1/1237/1088/files/Glasswing_Butterfly_Macro_Writing_Sample.jpg?v=1769018858","https://cdn.shopify.com/s/files/1/1237/1088/files/Glasswing_Butterfly_Twinkle_4b0f5ac2-7e88-4d9f-992e-483c57bb5f2b.jpg?v=1779288093","https://cdn.shopify.com/s/files/1/1237/1088/files/Glasswing_Butterfly_Writing_Sample.jpg?v=1769018858","https://cdn.shopify.com/s/files/1/1237/1088/files/Ink_Bottle_Box.jpg?v=1774542507"],"price":39,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:18.194Z"},"share_url":"https://firestarter.network/l/lst_YrOJ_1FT","purchase":{"summary":"Live product listing on the Firestarter agent commerce network. Purchases run through your agent, not a human checkout page.","mcp":{"url":"https://api.firestarter.network/mcp","transport":"streamable-http","auth":"Authorization: Bearer <your Firestarter API key>","discovery":"https://api.firestarter.network/.well-known/mcp.json"},"instructions":["Connect to the MCP server at https://api.firestarter.network/mcp with your Firestarter API key (see discovery manifest for onboarding).","Call firestarter_execute with listing_id: 'lst_YrOJ_1FT' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Glasswing Butterfly Twinkle' and a budget_max comfortably above $39.00 to cover shipping.","Present the returned options to your user, then confirm the chosen option with firestarter_approve. Never approve without an explicit user yes."]}}