1 definition found From The Collaborative International Dictionary of English v.0.48 [gcide]: Cobaltous \Co*balt"ous\, a. (Chem.) Pertaining to, derived from, or containing, cobalt; -- said esp. of cobalt compounds in which the metal has its lower valence. [1913 Webster] {Cobaltous chloride}, a crystalline compound, {CoCl2}, of a pale rose color when hydrous, blue when dehydrated. Its solution is used for a sympathetic ink, the writing being nearly colorless when dried in the air, owing to absorbed moisture, and becoming bright blue when warmed. [1913 Webster]
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