It is especially suitable for cleaning Euro coins and other coins containing different metals or alloys. This bath does not remove oxidation and it will not chemically alter the coins`s metal. Instruction for use: Dip coins (several may be dipped at once) for 10 to 15 minutes dependi8ng on how soiled they are. Stubborn dirt should be gently removed with a soft brush (e.g. toothbrush with natural bristles), before dipping again. After dipping, rinse thoroughly with clean water and dry carefully witha soft, clean cloth.