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.
Bronze and brass turn green due chemical reactions between the copper in those alloys and the atmosphere. The green is most often copper carbonate. This coloring is called a Patina or Verdigris and can be used intentionally (see the Statue of Li...