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Webster 1913 Edition
Cobaltous
Co-balt′ous
,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.