... in soil nitrate toilet, pigs, cattle pens house, courtyard of the old skirting, cliff, cave, and not easy to be rained on ... -red after sun exposure. Good soil nitrate on the burning charcoal on the red sparks will burst. 2)Industrial grade potassium nitrateIndex ... reagent and antiseptic.Defence : Wearing mask and gloves, no inhale the powder, protect skin 3.Storage:In cool, dry and airiness ...