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https://www.reddit.com/r/whatisthisthing/comments/9ocmzc/sterling_silver_ring_turned_gold_was_washing/
I think what is likely happening is that the copper is reacting with the moisture and the air and being pulled out of alloy with the silver forming a golden colour. Then this thin layer of copper oxidises and is either worn away, or will sit as a small amount of dark copper oxide on top of the ring.
https://www.finishing.com/228/67.shtml
Aug 08, 2008 · 1. Sometimes the remains of an old mercury thermometer may still be permeating an old drawer, and can turn gold a silver color. If the exposure is very minor, which would seem to be the case, it can even cure itself as the solid gold on the interior diffuses back to the surface. Please see my earlier entry about this.
https://moonmagic.com/blogs/news/tarnished-jewelry
Apr 08, 2020 · “Most gold used in jewelry is alloyed with silver, copper, and a little zinc to produce various shades of yellow gold, or with nickel, copper, and zinc to produce white gold,” they explain. “The colour of these gold alloys goes from yellow to white as the proportion of silver in them increases; more than 70 percent silver results in alloys that are white.”Estimated Reading Time: 8 mins
https://classroom.synonym.com/normal-sterling-silver-rings-change-colors-9181.html
1 Get Your Shine On When the copper in silver reacts to the moisture in the air, your ring first develops a slight golden hue and then turns a dark color. In addition to airborne moisture, copper also reacts to acidic foods such as onions and chemicals like bleach, ammonia and chlorine.
https://www.leaf.tv/articles/how-to-restore-silver-on-a-ring-that-has-turned-copper/
To correct this problem, silver jewelry is plated with a thin layer of pure silver. Normal wear and polishing will gradually rub the silver layer away, revealing the reddish color of the copper alloy. If you have a silver ring that is turning copper, you can restore its silver …
https://www.sincerelysilver.co/blogs/jewelry-blog/pros-and-cons-of-gold-plated-jewelry
Vermeil is a specific kind of gold plating.The process of creating a vermeil piece of jewelry involves coating sterling silver with a thin layer of gold that is at least 10 karats and 2.5 microns thick.To be legally called “vermeil,” the item must have a gold thickness of 2.5 microns and the coating must be over a sterling silver base.
https://www.afashionblog.com/how-to-keep-jewelry-from-turning-copper/
Dec 12, 2020 · Corrosion/oxidation. Jewelers mix various metals to increase tensile strength and make them more malleable and durable. For instance, pure gold is too soft for use in making jewelry. As such, it is combined with various proportions of base metals, like copper and silver, to make it more workable and harder.Estimated Reading Time: 7 mins
https://glimmergirlblog.wordpress.com/2014/06/04/3-things-you-can-do-if-your-silver-is-turning-black-and-other-colours/comment-page-1/
Jun 04, 2014 · A well-used silver polishing cloth. It’s one of the biggest complaints jewelers get; “Why is my silver jewelry turning grey, black or brown?” Frequently people think there’s something wrong with their jewelry when this happens, but in truth, tarnish is a natural reaction of silver …
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