![]() A bright yellow made from crocoite became a colour in fashion. The use of Siberian red lead as a paint pigment developed rapidly. In 1770, Peter Simon Pallas visited the same site as Lehmann and found a red "lead" mineral that had very useful properties as a pigment in paints. Though misidentified as a lead compound with selenium and iron components, the material was in fact lead chromate with a formula of PbCrO 4, now known as the mineral crocoite. In 1761, Johann Gottlob Lehmann found an orange-red mineral in the Ural Mountains which he named Siberian red lead. In medicine, as a dietary supplement or slimming aid, usually as chromium (III) chloride or chromium(III) picolinate.In well drilling muds as an anti-corrosive.Chromium(IV) oxide (CrO 2) is used to manufacture magnetic tape, where its higher coercivity than iron oxide tapes gives better performance.It is also used as a mordant (i.e., a fixing agent) for dyes in fabric. Potassium dichromate is a chemical reagent, used in cleaning laboratory glassware and as a titrating agent.Chromium salts are used in the tanning of leather.Chromite is used to make molds for the firing of bricks.also makes a brilliant yellow for painting. ![]() Chromium is what makes a ruby red, and therefore is used in producing synthetic rubies.Chromium salts colour glass an emerald green.Chromium(III) oxide is a metal polish known as green rouge. ![]()
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