COBALTOUS

Etymology

Adjective

cobaltous (comparative more cobaltous, superlative most cobaltous)

(chemistry) Containing cobalt in oxidation state 2.

Source: Wiktionary

Co*balt"ous, a. (Chem.)

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition

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