{"product_id":"tourmaline-sherl","title":"Tourmaline Sherl","description":"\u003cp\u003e\u003cstrong\u003eTourmaline Sherl\u003c\/strong\u003e is a natural black mineral pigment powder ground from schorl, the black, iron-rich tourmaline; the name Sherl follows the Russian spelling of schorl. Finely ground, it gives soft, semi-transparent gray-blacks with a greenish or brownish cast, a rare mineral black for glazes and subtle grays in oil, 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 gray-black with a greenish or brownish cast\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePigment type:\u003c\/strong\u003e Natural mineral pigment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComposition:\u003c\/strong\u003e schorl, a sodium iron aluminum borosilicate of the tourmaline group, NaFe\u003csup\u003e2+\u003c\/sup\u003e\u003csub\u003e3\u003c\/sub\u003eAl\u003csub\u003e6\u003c\/sub\u003e(BO\u003csub\u003e3\u003c\/sub\u003e)\u003csub\u003e3\u003c\/sub\u003eSi\u003csub\u003e6\u003c\/sub\u003eO\u003csub\u003e18\u003c\/sub\u003e(OH)\u003csub\u003e4\u003c\/sub\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlso known as:\u003c\/strong\u003e schorl, black tourmaline\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\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\u003eThe powder is ground to about 25 µm (supplier data). Schorl is hard (about 7 on the Mohs scale) but brittle, so it disperses well with a palette knife or muller in linseed oil, egg yolk, gum arabic or acrylic medium. Use it thinly as a dark, semi-transparent glaze, or mix it with white for quiet mineral grays. As a natural silicate it is rated fully resistant to light, acids and alkalis by the supplier.\u003c\/p\u003e\n\u003ch2\u003eAbout schorl\u003c\/h2\u003e\n\u003cp\u003eSchorl is the most common tourmaline, the sodium and iron member of the group, and may make up 95% or more of all tourmaline in nature. The name was in use before 1400: the Saxon village now called Zschorlau was then known as Schorl, and black tourmaline was found at its tin mine. Johannes Mathesius described it as schürl in 1562. Tourmaline crystals are pyroelectric and piezoelectric.\u003c\/p\u003e\n\u003ch2\u003eSafety\u003c\/h2\u003e\n\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\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003ch3\u003eWhat does Sherl mean?\u003c\/h3\u003e\n\u003cp\u003eIt is the Russian spelling of schorl, the black iron-rich tourmaline. Our pigment is ground schorl, also called black tourmaline.\u003c\/p\u003e\n\u003ch3\u003eIs Tourmaline Sherl a deep black?\u003c\/h3\u003e\n\u003cp\u003eNo. Finely ground schorl is lighter than the black crystals, so it gives soft, semi-transparent gray-blacks with a greenish or brownish cast rather than a dense, opaque black.\u003c\/p\u003e\n\u003ch3\u003eIs tourmaline pigment lightfast?\u003c\/h3\u003e\n\u003cp\u003eYes. It is rated 8 of 8 on the Blue Wool Scale and 5 of 5 for acid, alkali and lime resistance (supplier data).\u003c\/p\u003e","brand":"COLIBRI PIGMENTS LLC","offers":[{"title":"25g","offer_id":50080876429559,"sku":null,"price":27.9,"currency_code":"USD","in_stock":true},{"title":"1kg","offer_id":50080876462327,"sku":null,"price":980.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0643\/6696\/9079\/files\/tourmaline-sherl_5c36735f-9e97-456e-830b-e9519bb3bbb7.jpg?v=1793366781","url":"https:\/\/colibripigments.com\/products\/tourmaline-sherl","provider":"Colibri Pigments","version":"1.0","type":"link"}