{"product_id":"cerulean-blue-dark","title":"Cerulean blue dark","description":"\u003cp\u003e\u003cstrong\u003eCerulean blue dark\u003c\/strong\u003e is a synthetic inorganic pigment powder sold by our supplier as cobalt(II) stannate (PB35), in a deeper shade than our Cerulean blue. It gives a strong, clear azure blue that is opaque, lightfast and stable to alkalis and lime, for oil, acrylic, tempera, watercolor, gouache and fresco.\u003c\/p\u003e\n\u003ch2\u003eKey facts\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e deep, clear azure blue\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePigment type:\u003c\/strong\u003e Synthetic inorganic pigment (cobalt stannate)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColour Index:\u003c\/strong\u003e PB35 (C.I. 77368)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComposition:\u003c\/strong\u003e cobalt(II) stannate, Co\u003csub\u003e2\u003c\/sub\u003eSnO\u003csub\u003e4\u003c\/sub\u003e (supplier data)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e synthetic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpacity:\u003c\/strong\u003e opaque\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightfastness:\u003c\/strong\u003e 8 of 8 on the Blue Wool Scale (supplier data)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChemical resistance:\u003c\/strong\u003e alkali 5\/5, lime 5\/5, acid 5\/5 (supplier data, 5 = best)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuitable for:\u003c\/strong\u003e oil, acrylic, egg tempera, watercolor, gouache, fresco (lime), lime and cement plaster\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e 25 g jar · 1 kg bag\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eHow to use\u003c\/h2\u003e\n\u003cp\u003eMull it into linseed oil, gum arabic, egg yolk or acrylic medium with a muller or palette knife. Like all ceruleans it has low tinting strength but good covering power, so it works best on its own or with white for skies, water and cool lights. Grind it gently. Some painters bind ceruleans in poppy oil to keep the blue clean. It is lime-proof and also suits silicate binders and concrete. Store dry in a closed jar.\u003c\/p\u003e\n\u003ch2\u003eAbout cerulean blue dark\u003c\/h2\u003e\n\u003cp\u003eCerulean blue is cobalt stannate, first made around 1800 and sold to artists from the second half of the 19th century as \"coeruleum\", a name from the Latin caeruleus, \"blue\". It was used above all for painting skies. This dark grade gives a deeper azure than standard cerulean; our supplier lists the same composition and test values for both.\u003c\/p\u003e\n\u003ch2\u003eSafety\u003c\/h2\u003e\n\u003cp\u003eContains cobalt compounds: may cause allergic skin or respiratory reactions; harmful if inhaled. Handle dry pigment with care: avoid breathing the dust and contact with eyes. Wear a dust mask (FFP2\/N95) and gloves when working with the powder, work in a well-ventilated area and wipe up spills with a damp cloth. Do not eat, drink or smoke while working; wash your hands afterwards. Keep away from children and pets. For artistic and technical use only — not for cosmetics, food or tattoos.\u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003ch3\u003eHow does Cerulean blue dark differ from Cerulean blue?\u003c\/h3\u003e\n\u003cp\u003eBoth are sold by our supplier as cobalt stannate (PB35) with identical test data. The dark grade is a deeper, more intense azure; Cerulean blue is a lighter sky blue.\u003c\/p\u003e\n\u003ch3\u003eIs it lightfast and suitable for fresco?\u003c\/h3\u003e\n\u003cp\u003eYes. Our supplier rates it 8 of 8 for lightfastness and 5 of 5 for lime and alkali resistance, and cerulean is a lime-proof pigment.\u003c\/p\u003e","brand":"COLIBRI PIGMENTS LLC","offers":[{"title":"25g","offer_id":51694568341751,"sku":null,"price":20.9,"currency_code":"USD","in_stock":true},{"title":"1kg","offer_id":51696466428151,"sku":null,"price":730.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0643\/6696\/9079\/files\/cerulean-blue-dark.jpg?v=1793370262","url":"https:\/\/colibripigments.com\/products\/cerulean-blue-dark","provider":"Colibri Pigments","version":"1.0","type":"link"}