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adjective Cobaltous adj. (Chem.) Pertaining to, derived from, or containing, cobalt; said esp. of cobalt compounds in which the metal has its lower valence. 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.
Collaborative International Dictionary of English 0.48
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