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.
January 21, 2015 at 6:22 am. Hi Trish-Whatâs happening is the copper in the penny is reacting with the oxygen in the air to form the green-colored copper oxide. Although pennies are mainly zinc now, they are still plated in copper.