SANAA
UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
BURUDANI
MAZINGIRA
CHAKULA NA VINYWAJI
UHANDISI WA KINYUME
SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
Hatari
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.
Juu
Three days
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