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 thats simple to apply. Just heat metal with propane torch or other clean, convenient method and apply browning solution with swab. Immediate results no waiting for old-fashioned slow rust process which can take weeks to finish.