pin foils with vinegar, peroxide, and salt - Gold Refining ...
Nov 08, 2017· There are no major safety issues in storing vinegar, salt, or 3% hydrogen peroxide. Also, just like regular AP, once you have a copper chloride solution, there really is no need to use the peroxide to make new batches.. Time to process is not an issue for me, and I am less concerned about leaving this unattended for long periods of time.