... , Relative density2.1109, Melting Point 333°C. Use: Mainly for CRT glass bulbs, auto lights bulbs, glass clarifying agent. Used ... of compound fertilizers, foliar fertilization. Used to produce fireworks counted with purple sparks. Is to produce black powder, such as ... a hair color agent; preservatives, such as for bacon, luncheon meat played a preservative.. Potassium nitrate for sale CAS NO#7757-79-1