use:
Molecular formula: Co (NO3) 2 · 6H2O
Relative molecular mass: 290.89 (according to international relative atomic mass in 2011)
Appearance: light red powder
Uses: Mainly used as raw materials for the production of other cobalt salts, used as colorants in the ceramic industry, inks, coatings, paint driers, antidote for cyanide poisoning, and cobalt-containing catalysts.