P 2557 (OTTO) Potassium titanium oxalate, GR 99% Cas 14402-67-6 - used as a catalyst for the oxidation of aromatic compounds in the synthesis of carboxylic acids & acid anhydrides. P 2557 (OTTO) Potassium titanium oxalate, GR 99% Cas 14402-67-6 - used as mordant in dyeing cotton & leather. P 2557 (OTTO) Potassium titanium oxalate, GR 99% Cas 14402-67-6 - used as a pacifier in the ceramic industry.