Question

what does tarnishing of copper mean??
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Answer 1

Tarnish is a thin layer of corrosion that forms over copper, brass, aluminum, magnesium, neodymium and other similar metals as their outermost layer undergoes a chemical reaction. ... Tarnish actually preserves the underlying metal in outdoor use, and in this form is called patina

Answer 2

Explanation:

Copper tarnish occurs in a multi-stage process that first gives the metal a deep red color, then a black hue and finally the sea-green patina made famous by the Statue of Liberty and world landmarks such as the Berlin Cathedral, Vienna's Belvedere Palace and the Parliament Building in Victoria, British Columbia.

Copper tarnish may be a feature on architectural structures, but it can be an eyesore on copper sinks and pots, and there are ways to remove it.