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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.
Cobalt is used for a wide range of applications including: 1  The manufacture of super-alloys, the primary application of cobalt produced today. These super-alloys are, in turn, used in turbine blades for jet aircraft engines and gas turbines; medical orthopedic implants like hip and knee replacements; and permanent magnets.