Purity: 98% ,red odd inclined crystal ,use for making cobalt oxide and cobalt metal ,and Used as glass and ceramics colorants Analysis(%)Co ... materials, a small amount for making barometer, transference, etc. Cobalt chloride paper in dry is blue, damp into pink. Add a ... 40 mg; Agent: 0.3% solution.PROPERTY:red odd inclined crystal,becomes blue when heated and becomesred when cooled.rimed between ...