Black powder, soluble in acid, Insoluble in water and nitric acid, nonpoisonous ... 026 g/cm3 Appearance: Black powder, soluble in acid, Insoluble in water and nitric acid, nonpoisonous Typical Analysis ... ppm max0.5ppm maxV1ppm max1ppm maxK250ppm max250ppm maxInsoluble in HCL0.05% max0.1% maxSO42-1.3 ... battery and Li-Mn battery, and also used in industries of glass electronics, magnetic materials, dye, ...