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Potassium Dichromate from Chrome Ore and Nitre, Ure 1839
Bichromate of potash, the red salt of calico printers and dyers, comes from chrome ore. Andrew Ure (1839): roast the ground ore with saltpetre, wash out the yellow chromate of potash, and turn it red with an acid. Chromium(VI) salts cause cancer and burn the skin and eyes: wear gloves and goggles throughout.
The picture: potassium dichromate crystals.
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