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 Size: 8 fl. oz. Includes handy basket. JSP DILLER'S DULLER for scratched , maltreated or over-cleaned copper coins. Tones the coin by darkening. May take several applications, May work better if the coin is warmed. Use sparingly. Apply with a soft brush or cotton swab. A very small amount goes a long way. Wipe coin when tone of coin is just a shade lighter than you want and allow to darken by itself . It's best you experiment with a pre 1982 copper penny before working on you collector coin. Handle coin by the edges. It is best that you use common latex free gloves so finger oils do not disrupt the process. Stir DILLER'S DULLER a match or toothpick before each use.