Birchwood Casey Plum Brown Barrel Finish produces a rich authentic old-style brown finish for original or replica firearms. Plum Brown Barrel Finish is ideal for restoring antique guns muzzleloaders and other metal antiques. A durable protective and attractive finish that’s simple to apply. Just heat metal with propane torch or other clean convenient method and apply browning solution with sponge. Immediate results – no waiting for old-fashioned slow rust process which can take weeks to finish.