{"product_id":"chrysocolla-green","title":"Chrysocolla green","description":"\u003cp\u003e\u003cstrong\u003eChrysocolla green\u003c\/strong\u003e is a natural pigment powder ground from chrysocolla, a hydrous copper silicate mineral from the Democratic Republic of the Congo. Blue-green as a stone, it gives a soft, semi-transparent green when ground. This rare historic copper green suits egg tempera, watercolor, gouache and acrylic.\u003c\/p\u003e\n\u003ch2\u003eKey facts\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e soft green\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePigment type:\u003c\/strong\u003e Natural mineral pigment (copper silicate)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComposition:\u003c\/strong\u003e hydrous copper silicate, (Cu,Al)\u003csub\u003e2\u003c\/sub\u003eH\u003csub\u003e2\u003c\/sub\u003eSi\u003csub\u003e2\u003c\/sub\u003eO\u003csub\u003e5\u003c\/sub\u003e(OH)\u003csub\u003e4\u003c\/sub\u003e·nH\u003csub\u003e2\u003c\/sub\u003eO\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Democratic Republic of the Congo (supplier data)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlso known as:\u003c\/strong\u003e cedar green (historic name)\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 decomposed by acids, alkalis and heat\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuitable for:\u003c\/strong\u003e acrylic, egg tempera, watercolor, gouache\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot recommended for:\u003c\/strong\u003e fresco and lime plaster (alkalis decompose it)\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\u003eWork the powder into gum arabic for watercolor and gouache, egg yolk for tempera, or acrylic medium with a palette knife or a light muller. Chrysocolla is a soft mineral, so grind gently: over-grinding makes mineral greens paler. Its semi-transparent green suits washes and glazes over a light ground. Keep it away from lime, acids and heat, and store it dry.\u003c\/p\u003e\n\u003ch2\u003eAbout chrysocolla\u003c\/h2\u003e\n\u003cp\u003eThe name comes from the Greek for gold and glue: Theophrastus used it in 315 BC for a material used to solder gold. Chrysocolla forms in the oxidized zones of copper deposits. As a pigment it has been reported in Twelfth Dynasty Egyptian tombs, and in the 16th and 17th centuries it was used in watercolor under the name cedar green.\u003c\/p\u003e\n\u003ch2\u003eSafety\u003c\/h2\u003e\n\u003cp\u003eContains copper compounds: harmful if swallowed. 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 chrysocolla suitable for fresco?\u003c\/h3\u003e\n\u003cp\u003eNo. Chrysocolla is decomposed by alkalis such as lime, as well as by acids and heat, so use it in tempera, watercolor, gouache or acrylic.\u003c\/p\u003e\n\u003ch3\u003eIs chrysocolla lightfast?\u003c\/h3\u003e\n\u003cp\u003eYes. It is stable to light, and our supplier rates it 8 of 8 on the Blue Wool Scale.\u003c\/p\u003e\n\u003ch3\u003eHow does chrysocolla differ from malachite?\u003c\/h3\u003e\n\u003cp\u003eBoth are natural copper minerals. Malachite is a copper carbonate that fizzes in acid; chrysocolla is a hydrous copper silicate, blue-green as a stone, which grinds to a gentle green.\u003c\/p\u003e","brand":"COLIBRI PIGMENTS LLC","offers":[{"title":"25g","offer_id":50080923189495,"sku":null,"price":27.9,"currency_code":"USD","in_stock":true},{"title":"1kg","offer_id":50080923222263,"sku":null,"price":980.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0643\/6696\/9079\/files\/chrysocolla-green_e1fadc59-68d9-4aaf-aac1-61f44908e0d4.jpg?v=1793366709","url":"https:\/\/colibripigments.com\/products\/chrysocolla-green","provider":"Colibri Pigments","version":"1.0","type":"link"}