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Cobalt Chloride: Cobalt Oxide Dissolved in Hydrochloric Acid
Cobalt chloride is the starting salt for cobalt blue and cobalt violet. Thorpe (1912): dissolve cobalt oxide in hydrochloric acid and evaporate. Crystallised cool it holds six molecules of water; hotter crystallisation gives four or two. A strong solution turns blue.
The picture: cobalt chloride crystals (Wikimedia Commons).
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