... free sample 3.good quality 4.low price food grade potash alum1.Specifications 2012 Potash alum for water ... 1%0.08%Packing: 50kg 25kg plastic lined top-grade woven bag, or following your demands 4.Usages ... paper, Painting and dyeing of coating, drug, making of paint and leather, coagulant, processing of fiber board and rubber ... , paints, tanning, mordant, paper, waterproof agent. food grade potash alum