Does gold turn green?
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The first thing you can be sure of is that pure gold is the most stable and least reactive of all elements, and it will never turn green or black. 24K gold has 99.9% pure gold content, so 24K gold will never tarnish either. Unfortunately, for the durability of jewelry, jewelers usually add some base metals such as copper, zinc, nickel, palladium and silver. Unlike gold. These base metals usually react easily with oxidation, nickel is usually the fastest to react and leave traces on the gold, followed by copper which reacts with oxidation to produce copper green; and silver which darkens yellow gold and loses its luster. Gold is likely to tarnish for several reasons: firstly, the cosmetics you use have harder metals than pure gold separating the base metals in gold; secondly, prolonged exposure to oxygen causes oxidation of copper, nickel and silver accelerated by sweat and heat; thirdly, naturally acidic skin and heavy sweating can also cause oxidation of copper to produce copper oxide; finally, wear and tear of the gold plating layer exposes the color of the other metals inside.