Production of paints and pigments

Dyestuffs also require potassium compounds. KCl is used for salting out azo and anthraquinone dyestuffs with a sulphonic acid group from aqueous solutions. Generally, the dyestuffs’ potassium salts are less soluble than their sodium compounds.

In pigment production, potassium sulphate is particularly used as the potassium component for blue pigment and adjusting colour depth.