I just looked up the MSD (material safety data sheet) for the B/C Lead Away and there is no abrasive listed in the contents. The compound that comes closest is aluminum silicate - also known a kaolin used in ceramics, cosmetics and to treat upset stomachs but I could not find an use of aluminum silicate as an abrasive. However, I did find a FAQ asking if it would remove bluing and the B/C answer was "Yes".