Berry's Brass Bright Tumbler Polishing Additive contains no ammonia. It's specially formulated for cleaning and polishing cartridge brass as an additive to corncob grit in a tumbler. Just add Brass Bright to the corncob media in your tumbler. Turn the tumbler on and let the polish disburse through out the corncob media. Then, add your cartridge brass and watch how much more quickly your brass gets cleaned and polished when you use Brass Bright!For more information on tumblers, see our Berry's Tumbler Page.