{"product_id":"cobalt-cornflower-blue","title":"Cobalt cornflower blue","description":"\u003cp\u003e\u003cstrong\u003eCobalt cornflower blue\u003c\/strong\u003e is a synthetic inorganic pigment powder, cobalt aluminate modified with zinc and magnesium, (Co,Zn,Mg)Al\u003csub\u003e2\u003c\/sub\u003eO\u003csub\u003e4\u003c\/sub\u003e. It gives a soft, light cornflower blue that is semi-transparent, lightfast and resistant to acids, alkalis and lime, for watercolor, gouache, tempera, acrylic, oil and fresco.\u003c\/p\u003e\n\u003ch2\u003eKey facts\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e soft, light cornflower blue\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePigment type:\u003c\/strong\u003e Synthetic inorganic pigment (cobalt aluminate spinel)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColour Index:\u003c\/strong\u003e PB28 (C.I. 77346)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComposition:\u003c\/strong\u003e cobalt zinc magnesium aluminate, (Co,Zn,Mg)Al\u003csub\u003e2\u003c\/sub\u003eO\u003csub\u003e4\u003c\/sub\u003e\n\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 semi-transparent\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)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e 50 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 palette knife or muller into gum arabic, egg yolk, acrylic medium or linseed oil. Like other cobalt blues it has modest tinting strength, so use it generously, and grind it gently, because over-grinding dulls cobalt blues. It gives soft, light blues on its own and is useful for skies and cool tints. It is lime-resistant and also listed for silicate binders. Store dry in a closed jar.\u003c\/p\u003e\n\u003ch2\u003eAbout cobalt cornflower blue\u003c\/h2\u003e\n\u003cp\u003eCobalt blue pigments are made by calcining cobalt and aluminum oxides at high temperature, which forms a very stable spinel crystal. Small additions of zinc, magnesium, lithium or titanium oxides shift the shade within the same Colour Index family, PB28; in this grade zinc and magnesium give a lighter, softer blue than our Cobalt blue. The first cobalt aluminate blue was made by Louis Jacques Thénard in 1802.\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 is Cobalt cornflower blue different from Cobalt blue?\u003c\/h3\u003e\n\u003cp\u003eBoth are cobalt aluminate (PB28). Cornflower blue is modified with zinc and magnesium, which makes it lighter and softer; our Cobalt blue is a deeper, brighter blue.\u003c\/p\u003e\n\u003ch3\u003eCan I use it in fresco?\u003c\/h3\u003e\n\u003cp\u003eYes. Our supplier rates it 5 of 5 for lime and alkali resistance and lists it for fresco and silicate binders.\u003c\/p\u003e","brand":"COLIBRI PIGMENTS LLC","offers":[{"title":"50g","offer_id":50080859750647,"sku":null,"price":12.9,"currency_code":"USD","in_stock":true},{"title":"1kg","offer_id":50080859783415,"sku":null,"price":230.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0643\/6696\/9079\/files\/cobalt-cornflower-blue_f47ef7bc-a10b-4263-82a4-e554198576a1.jpg?v=1793366785","url":"https:\/\/colibripigments.com\/products\/cobalt-cornflower-blue","provider":"Colibri Pigments","version":"1.0","type":"link"}