Cobaltous chloride, chemical formula CoCl2. Pink to red crystal, anhydrous blue. Slightly deliquescent, soluble in water, ethanol, ether, acetone and glycerin.

Instrument manufacturing used for the production of barometer, hydrometer, wet and dry indicators. The ceramic industry uses colouring agents. The paint industry is used to make paint dryers. Used in animal husbandry for compounding feed. Used in the brewing industry as a stabilizer for beer foam. The defense industry uses it to make gas masks. Used as a catalyst in chemical reactions. In folding chemistry, it is used for spot analysis of zinc, haploid breeding, in addition, it is also used for manufacturing invisible ink, cobalt chloride test paper, and color-changing silica gel. It is also used as an absorbent of ammonia.