This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Both metal and copper oxidize when exposed to oxygen and this is a natural process. Copper that is exposed to the outside environment is more likely to turn green and that is why copper vases and decorative pieces in gardens are often green.
A. The best way to change the copper to green is to use muriatic acid. You normally use it to clean the grout between tiles. Do not dilute it and apply with a brush where you want it to turn green. It will do it over night.