Dissolves copper, bronze, cupro-nickel, brass fouling in the bore twice as fast without brushing. Will protect all metal parts including the bore against corrosion & rust. Totally safe for all steels (both stainless and carbon) Dissolves carbon without brushing Color indicators show the presence of metal fouling, powder fouling and carbon. Odorless, relatively safe, and easy to use. Contains NO ACID and NO AMMONIA.