JSP COIN CLEANER is made for silver, copper and gold coins Instantly removes tarnish and finger marks from un-circulated and proof coins New formula keeps coins bright long after cleaning. This product is Invaluable to the numismatist Will not harm silver, but may remove artificial oxidation Do NOT use on stainless steel, lacquered surfaces, platinum or artificially oxidized silver. 1 gallon 128 ounces 3.7 liters