It can take five or more years for atmospheric conditions to produce a copper patina, but you can produce an attractive artificial patina in a much shorter time.
You will need
- Protective gear
- A copper object
- A commercial metal cleaner
- Ammonium chloride crystals
- A paintbrush
- 1 c. lemon juice
- 1 c. table salt
- 1 c. household ammonia
- 1 c. vinegar
- Trisodium phosphate (TSP) cleaner (optional)
Step 1 Clean the surface Remove any dirt, oil, or grease from the surface of the copper object. They will interfere with the chemical action of the aging solution.
Use a commercial chemical metal cleaner such as trisodium phosphate to clean the surface.
Step 2 Prepare an ammonium chloride solution Add ammonium chloride crystals to water until no more will dissolve, and brush the solution on the thoroughly cleaned copper surface.
Ammonium chloride crystals are sold commercially as sal ammoniac.
Step 3 Prepare a patina solution Make a patina solution using one cup each of lemon juice, table salt, household ammonia, and vinegar
Step 4 Apply the patina solution to the copper surface Apply the solution to the clean metal surface and allow it to react.
Did You Know:
Did you know? Copper is second only to silver in its ability to conduct electricity, and is an excellent conductor of heat.