noun
: a chloride of cobalt ; usually : the dichloride CoCl 2 crystallizing ordinarily with six molecules of water, being dark red when hydrated, blue when dehydrated, and used in solution as a secret ink
noun
: a chloride of cobalt ; usually : the dichloride CoCl 2 crystallizing ordinarily with six molecules of water, being dark red when hydrated, blue when dehydrated, and used in solution as a secret ink
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012