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en.wikipedia.org/wiki/Tarnish

Tarnish is a thin layer of corrosion that forms over copper, brass, silver, aluminum , magnesium and other similar metals as their outermost layer undergoes a ...

www.onecklace.com/tips/does-real-gold-tarnish

Gold tarnishing is the slight corrosion of the gold surface and is evident as a dark ... compounds mixing with moisture are the most common cause of tarnishing.

www.ganoksin.com/article/gold-jewellery-tarnishing

Tarnishing is superficial corrosion of the carat gold surface and is evident by a ... cause tarnishing, as may other agents such as perfume or deodorant sprays.

www.jewelrygenius.com/tarnish.html

Blackening or discoloration of either the skin and clothing or the jewelry itself is certainly very annoying. There are several causes for these occurrences, ...

www.finishing.com/150/06.shtml

What causes this effect? We all know that gold is a very inert metal & does not corrode or rust. In this case, it should not tarnish. Under what circumstances or ...

www.ebay.com/gds/Top-5-Ways-to-Clean-Vintage-or-Tarnished-Gold-Jewelry-/10000000178706296/g.html

Likewise, tarnished gold jewelry requires extreme care, whether it is vintage or not ... cause a film to form over gold, which can make it appear dull and lackluster .

corrosion-doctors.org/MatSelect/corrgold.htm

Gold Tarnishing. Possible causes include: (reference). Perspiration (everyone's body chemistry is different, hence this is why some are more susceptible than ...

lisanelsondesigns.com/jewelry_care

Unfortunately, tarnish is an inevitable occurrence with any metal except gold and platinum. But what causes it? Over time, exposure to moisture and air can ...

www.leaf.tv/articles/how-to-fix-tarnished-gold

Pure gold does not react with oxygen, which means it is unlikely to tarnish. However, many pieces of gold jewelry have other metals mixed in, causing the gold to ...