cobaltous hydroxide

or cobalt hydroxide, cobaltic hydroxide

noun

a rose-red, amorphous, water-insoluble powder, Co2O3⋅3H2O, used chiefly in the preparation of cobalt salts and in the manufacture of paint and varnish driers.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018