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.
Freshly formed, copper is a beautiful rosy-pink color. Before long, however, it changes to a darker russet-brown. Under certain circumstances, it may turn red, black or blue-green. Environment. Copper metal that is required to maintain its color may be treated with an organic coating. Single-strand copper wire for electrical purposes does not usually tarnish enough to warrant special treatment. However, fine, multistranded copper wire is usually wrapped with layers of insulating materials. If the wire is kept wrapped, oxidation is quite low, and its color is maintained. Naked copper, however, will inevitably change color according to its particular environment. Attack