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.
Mar 11, 2015 11:51 AM CDT. Haemocyanin is blue because it is copper based - when copper oxidizes it turns bluish green (think the statue of liberty.) Our blood is red because it is iron based and when iron oxidzes it turns red (think rust).