The metal's distinctive natural green patina has long been coveted by architects and designers. The final patina is a particularly durable layer that is highly resistant to atmospheric corrosion, thereby protecting the underlying metal against further weathering. It can be a mixture of carbonate and sulfate compounds in various amounts, depending upon environmental conditions such as sulfur-containing acid rain. Architectural copper and its alloys can also be 'finished' to embark a particular look, feel, and/or color. Finishes include mechanical surface treatments, chemical coloring, and coatings. COUNT 5
QSN1 What pigment color is natural to copper? ANS1 green QSN2 What property does the final patina on cooper have? ANS2 highly resistant to atmospheric corrosion QSN3 What mixture of compounds is the final patina? ANS3 carbonate and sulfate QSN4 What conditions effect the mixture of carbonate and sulfate in copper? ANS4 environmental QSN5 What can be done to copper to give it a certain look? ANS5 finished