Used with pickling compound to remove firescale and oxidation from silver, gold, and other non-ferrous metals. Unit will automatically keep solution at the right temperature and prevent it from boiling. Equipped with 16 oz. stoneware bowl. 110 volt. Includes one Sparex #2 Granular dry acid compound for pickling, cleaning and removing surface oxidation, scale, and incrustation from metals. Used for pickling gold, silver, and copper based alloys. Easy to use, longer lasting, safe replacement for dangerous sulfuric acid in effective cleaning and pickling of metals, and produces smooth, clean, bright surfaces quickly and economically, without destroying fine detail or tolerances by minimizing the risk of over-pickling, pitting, burning, and wire brushing. It is non-hazardous, non-flammable, non-explosive compound. This 10 Oz. bag makes one quart of solution.