cobaltous chloride
Quick Summary
Cobaltous chloride, also known as cobalt chloride, is a chemical compound with the formula CoCl2. It is a chloride of cobalt, specifically the dichloride form. This compound is notable for its color-changing properties: it is blue when dehydrated but turns red in the presence of moisture, making it useful as a humidity indicator. Cobalt itself is a ferromagnetic metal and a chemical element found in Group 9 of the periodic table. Cobalt compounds have been used for centuries to color glazes and ceramics blue. In its compounds, cobalt typically exhibits oxidation states of +2 (cobaltous) or +3 (cobaltic).123
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