3 oz Shaker Blottle. Use this cleaner to prepare metal surfaces for patinas and enamels. this is a special "soft abrasive" with tiny acid component that clean and deoxidizes metals. Get smooth even coloring eveytime. It is espeically effective on copper for enameling and can replace acid colutions. What makes it so speical is that is has a rounded abrasive. It will acutally bring metal up to a soft shine. It only take gentle pressure to bring nonferrous metals up to a soft shine.