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https://www.leaf.tv/articles/how-to-restore-silver-on-a-ring-that-has-turned-copper/
Because silver is a soft, expensive metal, silver jewelry is forged from an alloy containing silver and copper or silver, copper and zinc. The one drawback to the inclusion of copper is its reddish hue. To correct this problem, silver jewelry is plated …
https://www.elf925.com/blog/silver-necklace-turned-copper-color/
Aug 18, 2014 · Your silver jewelry is turning a copper color because it’s not actually solid silver. It’s copper that’s been plated with silver. Over time, as the silver wears away, the copper underneath becomes exposed. Other than have it re-plated, there’s nothing you can do to fix the problem, except ensure you buy real solid silver next time.
https://www.ehow.com/info_8406538_can-silver-turning-copper-color.html
Tarnish & Corrosion. Sterling silver tarnishes when the metal reacts with sulfur compounds in the air and with the salts, oils and acids from your skin. Sterling silver stored in an unclean condition in a damp place may develop crusty green deposits from corrosion of the copper in the silver alloy.
https://moonmagic.com/blogs/news/tarnished-jewelry
Apr 08, 2020 · These byproducts of burning fossil fuels can cause silver to turn dark. And exposure to oxygen, salt, and moisture can cause a discoloration in 925 sterling silver, which is 7.5% copper.
https://blog.centimegift.com/does-sterling-silver-tarnish/
Jun 24, 2017 · This is a tricky question, as technically, tarnishing does not occur in pure silver. However, pure silver is too soft to be used in jewelry crafting. Therefore, jewelers will often add a small quantity of copper to strengthen the silver. The resulting product is .925 sterling silver, which contains 92.5% pure silver and 7.5% copper.
https://moonmagic.com/blogs/news/sterling-silver-green-fingers-the-causes-what-you-can-do-about-it
When your jewelry is made of 925 Sterling Silver and 925 Sterling Silver coated with 14kt Yellow or Rose Gold, it means that the composition is 92.5% pure silver which has been alloyed with 7.5% copper. The mix with copper provides the durability and workability necessary to create jewelry. While the copper is a vital part of the creation process, it has a tendency to result in the green coloring on your fingers.
https://answers.yahoo.com/question/index?qid=20100519161559AAFGQQR
May 19, 2010 · So, yes, sterling silver is made of a small percentage of copper by default. During the casting process if the sterling silver goes above temperature, silver could burn off and/or if the...
https://www.quora.com/Why-do-my-silver-necklaces-always-turn-bronze-coloured-and-how-do-I-prevent-this
If your necklace turns a bronze or copper color, check to see if the necklace is silver plated. Chances are that the bronze/copper color is just that the plating has worn off. There is nothing you can do about this except to re-plate the necklace or buy silver with at least 92.5% purity.
https://www.jewelry-auctioned.com/learn/trending-jewelry-news/jewelry-turns-skin-green
Unfortunately, there is a stigma that cheap jewelry causes skin discoloration, when in fact it’s a matter of metals. Because silver is naturally in liquid form, it’s mixed with alloyed metals to harden it. During this process, jewelers use a combination of metals and often, copper is added to the mix.
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