{"product_id":"caput-mortuum-violet","title":"Caput Mortuum Violet","description":"\u003cp\u003e\u003cstrong\u003eCaput Mortuum Violet\u003c\/strong\u003e is a synthetic iron oxide pigment powder (PR101) in a deep reddish violet, made by strongly heating iron sulfate with a little salt. Opaque, lightfast and stable in mixtures, it gives the cool purple-brown of caput mortuum in oil, acrylic, egg tempera, watercolor, gouache and fresco.\u003c\/p\u003e\u003ch2\u003eKey facts\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e deep reddish violet (purple-brown)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePigment type:\u003c\/strong\u003e Synthetic inorganic pigment (iron oxide)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColour Index:\u003c\/strong\u003e PR101 (C.I. 77491)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComposition:\u003c\/strong\u003e iron(III) oxide, Fe\u003csub\u003e2\u003c\/sub\u003eO\u003csub\u003e3\u003c\/sub\u003e, in relatively large crystals of 2–6 µm (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 Mars violet\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 (supplier data, 5 = best); stable in weak acids, dissolved by strong mineral acids\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuitable for:\u003c\/strong\u003e oil, acrylic, egg tempera, watercolor, gouache, fresco (lime), ceramics\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\u003ch2\u003eHow to use\u003c\/h2\u003e\u003cp\u003eMix the powder into linseed oil, egg yolk, gum arabic or acrylic medium with a palette knife or muller; for fresco, grind it in water and paint into fresh lime plaster. Grind gently: its violet tone comes from relatively large particles, and heavy grinding shifts it toward red. It covers well, so add it to mixtures in small amounts. With white it gives soft mauves; with ultramarine, deep violet shadows.\u003c\/p\u003e\u003ch2\u003eAbout Caput Mortuum Violet\u003c\/h2\u003e\u003cp\u003eRed iron oxides look more violet the larger their particles: around 1–5 µm the color moves from red toward purple. The supplier makes this pigment by calcining iron sulfate (copperas) with 3–5% common salt; without salt, the same process gives English red. The supplier names specular hematite as its natural counterpart. Violet iron oxides of this kind are also sold as Mars violet.\u003c\/p\u003e\u003ch2\u003eSafety\u003c\/h2\u003e\u003cp\u003eHandle 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\u003ch2\u003eFAQ\u003c\/h2\u003e\u003ch3\u003eHow does it differ from Caput mortuum?\u003c\/h3\u003e\u003cp\u003eCaput Mortuum Violet is a synthetic iron oxide (PR101) with a cooler, more violet tone. Our Caput mortuum is made from natural iron oxides (PR102) and is browner.\u003c\/p\u003e\u003ch3\u003eIs it lightfast and lime-proof?\u003c\/h3\u003e\u003cp\u003eYes. The supplier rates it 8 of 8 for lightfastness and 5 of 5 for lime and alkali resistance.\u003c\/p\u003e\u003ch3\u003eIs it toxic?\u003c\/h3\u003e\u003cp\u003eNo specific hazard is known: iron oxides are considered non-toxic. Like any fine powder, the dust can irritate the eyes and airways, so follow the precautions above.\u003c\/p\u003e","brand":"COLIBRI PIGMENTS LLC","offers":[{"title":"25g","offer_id":49301783675127,"sku":null,"price":5.9,"currency_code":"USD","in_stock":true},{"title":"1kg","offer_id":49301783707895,"sku":null,"price":210.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0643\/6696\/9079\/files\/caput-mortuum-violet_de561a70-a3ee-46c3-9ada-ba59d3698fd5.jpg?v=1793366813","url":"https:\/\/colibripigments.com\/products\/caput-mortuum-violet","provider":"Colibri Pigments","version":"1.0","type":"link"}