Cobalt chloride, a chemical compound with the formula Co Cl2, although the term is used also to refer to the hexahydrate, which is a different chemical compound
Imagine a sparkler...Cobalt Chloride sends off millions of tiny, yellow sparks that shoot upward with the flame. Do not get to close when doing a flame test
Cobalt chloride is a Lewis acid, so any Lewis base (including some Bronsted-Lowry bases) will be able to neutralise it. This includes substances like hydroxides, basic salts and ammonia.