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Cobalt Oxide: Cobalt Ore Roasted to Drive Off Arsenic, Ure 1839
Cobalt was hardly used as a metal in 1839, but its oxide was the blue of glass, porcelain glazes and stoneware. Andrew Ure describes how it was made: cobalt ore pounded, sieved and roasted for hours on the floor of a reverberatory furnace, the sulphur burning off and the arsenic carried up the flue as poisonous white oxide, while the cobalt is turned to its colouring oxide.
The picture: cobalt oxide made from cobalt ore at the Blaafarveværket blue-colour works, Modum, Norway (museum display).
Juu
A day of roasting
Maudhui hatari
Blueprint hii ina taratibu za hatari. Ingia na uwashe maudhui ya hatari katika mipangilio ya akaunti yako ili kuona maagizo ya hatua kwa hatua.
IngiaMchoro huu unatengeneza
CC0 Umma Wote
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Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.