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.
Iron gives the hemoglobin of blood itâs red color and allows the blood to carry oxygen. The iron in a metal pail turns to rust when exposed to water and oxygen. In a similar way, iron minerals in water turn to rust and stain plumbing fixtures and laundry.