Designed for cleaning metal surfaces after casting. The term “P P Pickler” likely refers to a pickling solution containing 10% Sulfuric acid, which is commonly used for this purpose. The pickling solution removes oxides and flux residues from the metal surface, restoring its shine and preparing it for further work. Sulfuric acid is a strong acid, so proper safety measures are essential. This includes wearing gloves, goggles, and working in a well-ventilated area.