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Description. Cobalt(II) chloride (CoCl 2) is the most common cobalt compound found in laboratories. The dramatic color change of blue-purple Cobalt(II) chloride to a rose color when hydrated makes CoCl 2 an excellent indicator for water in dessicants.
When isolated, cobalt is well known for its deep blue color and has been used to provide this pigment in rings and jewelry since jewelry has been produced by man. Cobalt jewelry and cobalt rings are made primarily of cobalt, but more accurately they can be called Cobalt Chrome rings and Cobalt Chrome Jewelry.