A solution of vinegar and salt or rapid fixer quickly ages copper, and it is safe to use at home. White vinegar, salt, steel wool, dish soap, paper towels and a sealant are needed to complete the aging process of copper. Before placing the solution onto the copper, thoroughly clean the copper piece with dish soap, scrubbing it with steel wool.
Mix equal parts of salt and vinegar together in a bowl before adding the copper to the bowl. Allow it to sit for 30 minutes, and then remove the copper from the bowl and set on a paper towel. The copper must air dry for the process to work. Once the copper has achieved the desired aging level, seal it in a lacquer or wax.
Copper can also be aged quickly using rapid fixer, a solution commonly found at camera stores. To complete the process, the rapid fix solution, latex gloves, a sealant, a plastic tray and paper towels are needed. Clean the copper before adding it to the rapid fix solution. For every tablespoon of rapid fix solution used, add 2 tablespoons of water. Place the copper into the solution for 10 minutes before rinsing it under cool water. Allow it to air dry before coating it in a sealant.