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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

When lower karat gold jewelry tarnishes, it does so in a much slower phase than sterling silver. Here are some of the common reasons that will trigger or hasten ...

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

Another cause of discoloration is due to the corrosion of the metals from which the jewelry is made. Pure gold, 24K, itself will not corrode but is too soft for many  ...

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 .

theassayoffice.co.uk/tarnish_labexpert

Most types of paperboard in contact with silver, copper and certain copper-zinc based low carat gold alloys cause localised tarnish stains on the metal surface.

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 ...

tracyandstacy.blogspot.com/2008/02/real-gold-can-tarnish-and-discolor.html

Feb 26, 2008 ... Many folks believe that "real" gold, meaning karated gold like 14k or 10k gold, should never discolor- that is a sign that your piece of jewelry is ...

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 ...