Where sapphire gets its blue tint mainly from iron, rubies get their pink to blood-red hue from chromium. So [NightHawkInLight]’s recipe starts with aluminum oxide grit-blasting powder and ...
A browse through images of chromium compounds on Wikipedia shows a whole spectrum of colours: dark red chromium(VI) oxide, orange-red lead chromate, bright yellow sodium chromate, brilliant chrome ...
Menzies, I. A., and Mortimer, D., Second Int. Cong. Metallic Corp., New York, 1963. Menzies, I. A., and Mortimer, D., Corrosion Sci., 5, 539 (1965).
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