Birchwood Casey Brass Black Metal Touch-Up (946 ml / 32 oz)

A fast-acting liquid that blackens or antiques brass, copper and bronze parts with no dimensional change, and is also used to mark cartridge cases so different loads can be told apart. The finish ranges from deep grey to black depending on the alloy; a clear coat, wax or oil improves it. This is the 946 ml (32 oz) bulk bottle.