Thread: Copper remover

Aqueous ammonia, 29%, worked through with barrel solvents using a nylon brush so I guess it forms an emulsion. I don't leave the mix in the barrel for very long, but then have never needed to as it is quite effective. I've not seen any sign of chemical action on the steel in the timeframe used. Most of the ammonia would outgas pretty quickly if not sealed in, and the dilute electrolyte of various bits and bobs formed in combination with atmospheric oxygen probably isn't very good for barrels in the long term. That is probably how ammonia gets its bad reputation.