{"type":"firestarter.listing","listing":{"id":"lst_IqyStx6X","product_name":"Cerulean","category":null,"description":"A synthetic bright, cool blue with high opacity and lightfastness. Cerulean paints with a very consistent smooth texture.\nDiscovered by Swiss chemist Albrecht Hopfner in 1789 and introduced to a wider market in the UK by art materials manufacturer George Rowney in the 1860s, it became an important addition to synthetic blues of the time like Prussian Blue, Cobalt Blue and Ultramarine and is still coveted for its opacity and use in painting skies. Berthe Morisot used the color in her 1879 painting Summer’s Day.\nAll of our watercolors handmade in our shop using the highest quality earth and synthetic pigments and natural watercolor binding medium made from gum arabic (sap from acacia trees), honey, glycerine and distilled water.\nHalf Pans contain around 2ml of paint and are approximately 3/4\" x 1/2\" x 3/8\" deep.\nColor Index number as provided by vendor: PB15. All of our watercolors conform to ASTM D-4236.","images":["https://cdn.shopify.com/s/files/1/0631/2017/9426/products/Cerulean_7e9d5c3f-cae1-46f3-b463-0a80a8c8ba05.jpg?v=1657762547","https://cdn.shopify.com/s/files/1/0631/2017/9426/products/Cerulean-Square_0b572991-19ef-4049-b775-49e5fe760017.jpg?v=1657762547","https://cdn.shopify.com/s/files/1/0631/2017/9426/files/Watercolor_Half_Pan_Trio.jpg?v=1773278386"],"price":6,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:22.328Z"},"share_url":"https://firestarter.network/l/lst_IqyStx6X","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_IqyStx6X' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Cerulean' and a budget_max comfortably above $6.00 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."]}}