Polarised light micrograph of crystals of beta-alanine, aluminium potassium hexacyanoferrate and aluminium potassium sulphate. Potassium hexacyanoferrate (III) is used as an anti-caking agent in granulated materials such as table salt. It is also used to remove heavy metal ions from products including wine and soy protein. It finds uses in the production of paints, printing inks, staining, leather industry, pharmacy, heat treatment of metal, metallurgy among other industries.