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.
4.Copper Pipe Problems: Green-Blue Water. Sometimes the water has a greenish tinge to it, and green-blue stains will form in your bathtub or your sink. This is a problem in houses with copper plumbing, your faucets or your brass fittings. The copper in the pipe mixed with the water and lends it a green cast. The copper can leave behind stains as well when the water evaporates and a copper compound is left behind. Copper can be harmful to humans in large quantities and can cause gastrointestinal diseases and kidney or liver damage if ingested long-term.