... .50.010.00020.0021.0 ItemunitCriteriaAnalysis resultsconclusionAluminium potassium sulfate%99.2min99.5EligibleHeavy metal(As Pb)%0.002max0. ... of alum is potassium aluminum sulfate, containing aluminum ions, so excessive intake may affect body iron, calcium absorption components, leading to ... as a drug. Alum can also be used to prepare aluminum, paints, tanning, mordant, paper, waterproof agent. food ...