Alchemy England 1977 product is made from the finest quality English Pewter, which, like silver, may naturally tarnish dependent upon the conditions to which it is subjected. You may easily polish your Alchemy piece to a brilliant, high luster, ‘antiqued’ patina finish with ‘Silvo’ or ‘Brasso” polishing wad, (in an emergency, tooth powder or similar can be used). Please do not put pewter in a dishwasher as this will damage the finish of your product.