Sparex No. 2 Granular Dry Acid Compound For Pickling, Cleaning & Removing Surface Oxidation. This is a new container of granular dry acid compound. Used for pickling, cleaning and removing surface oxidation. Makes one gallon of solution. This is a safe replacement for dangerous sulphuric acid in effective cleaning and pickling of metals. Minimizes hazards of acid burns, corrosive and poisonous fumes, hazardous storage, accidents, etc. This minimizes over pickling, pitting, burning and wire brushing. It produces smooth, clean, bright surfaces quickly and economically without destroying fine detail or tolerance.