{"product_id":"cerulean-blue","title":"Cerulean blue","description":"\u003cp\u003e\u003cstrong\u003eCerulean blue\u003c\/strong\u003e is a synthetic inorganic pigment powder, cobalt(II) stannate (Co\u003csub\u003e2\u003c\/sub\u003eSnO\u003csub\u003e4\u003c\/sub\u003e, PB35): genuine cerulean, a clear sky blue with a slight green tone. It is opaque, lightfast and stable to alkalis, lime and weather, and is used in oil, acrylic, tempera, watercolor, gouache and fresco, above all for skies.\u003c\/p\u003e\n\u003ch2\u003eKey facts\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e clear sky blue with a slight green tone\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, with small amounts of magnesium and aluminum oxides (supplier data)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e synthetic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlso known as:\u003c\/strong\u003e coeruleum, Höpfner blue\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 with a muller or palette knife into linseed oil, gum arabic, egg yolk or acrylic medium. Cerulean has very low tinting strength but covers well, so it is used mostly on its own or with white for skies and cool light blues rather than as a strong mixing color. In watercolor it can look slightly chalky, which it loses in oil; some painters bind it in poppy oil to keep the blue clean. It is lime-proof and suits fresco, silicate binders and concrete.\u003c\/p\u003e\n\u003ch2\u003eAbout cerulean blue\u003c\/h2\u003e\n\u003cp\u003eCobalt stannate was first made around 1800 (sources give 1789 and 1805) and became known as Höpfner blue. It entered artists' palettes in the second half of the 19th century, when British colormen sold it as \"coeruleum\", from the Latin caeruleus, \"blue\", related to caelum, \"sky\". It was used mainly for painting skies.\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\u003eIs this genuine cerulean blue?\u003c\/h3\u003e\n\u003cp\u003eYes. According to our supplier it is cobalt stannate, PB35. Some paints sold as cerulean contain cobalt chromite, PB36, instead; we sell that pigment separately as Cobalt Chrome Sea Wave.\u003c\/p\u003e\n\u003ch3\u003eHow does Cerulean blue differ from Cerulean blue dark?\u003c\/h3\u003e\n\u003cp\u003eBoth are sold by our supplier as cobalt stannate (PB35) with the same test data. Cerulean blue is the lighter sky blue; Cerulean blue dark is a deeper azure.\u003c\/p\u003e\n\u003ch3\u003eCan cerulean be used in fresco?\u003c\/h3\u003e\n\u003cp\u003eYes. It is lime-proof (supplier data: lime 5\/5) and suits fresco and other lime techniques.\u003c\/p\u003e","brand":"COLIBRI PIGMENTS LLC","offers":[{"title":"25g","offer_id":51694568276215,"sku":null,"price":19.9,"currency_code":"USD","in_stock":true},{"title":"1kg","offer_id":51696466395383,"sku":null,"price":700.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0643\/6696\/9079\/files\/cerulean-blue.jpg?v=1793370255","url":"https:\/\/colibripigments.com\/products\/cerulean-blue","provider":"Colibri Pigments","version":"1.0","type":"link"}