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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, element 27, is a transition metal, and it is in Group 9 on  the periodic table.    Cobalt is critical to industry. It is used in making a number of  differentâ¦ metal alloys, as a catalyst, and is used in compounds to  manufacture coloring agents.