{"product_id":"viridian","title":"Viridian","description":"\u003cp\u003e\u003cstrong\u003eViridian\u003c\/strong\u003e is a synthetic inorganic pigment powder, hydrated chromium(III) oxide (PG18): a cool, transparent emerald green. It is highly permanent and lime-resistant, prized for brilliant glazes in oil and watercolor, and also suitable for acrylic, egg tempera, gouache, fresco and lime plaster.\u003c\/p\u003e\n\u003ch2\u003eKey facts\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e cool emerald green, transparent\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePigment type:\u003c\/strong\u003e Synthetic inorganic pigment (hydrated chromium oxide)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColour Index:\u003c\/strong\u003e PG18 (C.I. 77289)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComposition:\u003c\/strong\u003e hydrated chromium(III) oxide, Cr\u003csub\u003e2\u003c\/sub\u003eO\u003csub\u003e3\u003c\/sub\u003e·2H\u003csub\u003e2\u003c\/sub\u003eO\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 Guignet's green, transparent oxide of chromium, vert émeraude\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpacity:\u003c\/strong\u003e 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), lime and cement plaster\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot recommended for:\u003c\/strong\u003e ceramics and other high-heat uses (above about 200 °C it loses water and turns into chromium oxide green)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e 10 g jar · 1 kg bag\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eHow to use\u003c\/h2\u003e\n\u003cp\u003eMull the powder thoroughly into linseed oil, acrylic medium, egg yolk or gum arabic. Viridian absorbs a lot of oil (about 80–100 g per 100 g, supplier data), so add oil gradually and use no more than needed to avoid yellowing. Thin layers glaze a brilliant emerald green, thick layers look dark green, and mixtures with white give cool bluish greens. It dries fairly quickly in oil.\u003c\/p\u003e\n\u003ch2\u003eAbout viridian\u003c\/h2\u003e\n\u003cp\u003eViridian was first prepared in Paris in 1838 by the color maker Pannetier and his assistant Binet. In 1859 the French chemist C. E. Guignet patented a cheaper process that made it widely available, hence the name Guignet's green. J. M. W. Turner reportedly used it as early as 1840, and Winsor \u0026amp; Newton listed it in 1849.\u003c\/p\u003e\n\u003ch2\u003eSafety\u003c\/h2\u003e\n\u003cp\u003eViridian is a chromium(III) compound, far less hazardous than chromates (hexavalent chromium), but pigment grades may contain traces of soluble hexavalent chromium: avoid breathing the dust. 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\u003eWhat is the difference between viridian and chromium oxide green?\u003c\/h3\u003e\u003cp\u003eBoth are chromium(III) oxides. Viridian (PG18) is the hydrated form: transparent, brighter and cooler. Chromium oxide green (PG17) is anhydrous: opaque, duller and more olive.\u003c\/p\u003e\n\u003ch3\u003eCan viridian be used in fresco?\u003c\/h3\u003e\u003cp\u003eYes. Our supplier rates it 5 of 5 for lime and alkali resistance and recommends it for fresco and for lime and cement plaster.\u003c\/p\u003e","brand":"COLIBRI PIGMENTS LLC","offers":[{"title":"10g","offer_id":51694551826679,"sku":null,"price":11.9,"currency_code":"USD","in_stock":true},{"title":"1kg","offer_id":51696458170615,"sku":null,"price":1050.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0643\/6696\/9079\/files\/viridian.jpg?v=1793370210","url":"https:\/\/colibripigments.com\/products\/viridian","provider":"Colibri Pigments","version":"1.0","type":"link"}