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http://lynncoins.com/brown-spotting-gold-coins.htm
Gold coins (and even pure gold bars) can sometimes develop brown (rust colored spots) on them. Yes, a gold plated item (when the gold plating wears off) would expose the non-gold metal underneath and that exposed metal could tarnish or rust. However, a brown or reddish spot on gold doesn't mean the item is not real solid gold.
https://www.pricescope.com/community/threads/help-yellow-gold-problem-what-is-causing-these-spots.87343/
Jun 11, 2008 · Before you start appliying "cures"and polishes you must know what metal you are dealing with.The wrong cleaner could do damage so be careful please.The locket you have is either Karat gold,Vermail or gold filled.I believe its gold filled because acids will discolor gold plate and show itself with the color brown/red marks or spots.The acids in my perspiration will discolor gold filled and low karat gold like 10 karat.Because the spots …Estimated Reading Time: 10 mins
https://www.leaf.tv/articles/how-to-clean-gold-jewelry-thats-turning-black/
Mix a weak solution consisting of 6 parts ammonia and 1 part warm water in a small cup or bowl. Dip the jewelry into the mixture, and then scrub it gently with a soft toothbrush or a cotton swab. Rinse the jewelry thoroughly with warm water to be sure the ammonia is completely removed.
https://www.ganoksin.com/article/gold-jewellery-tarnishing/
Gold Jewellery Tarnishing. Tarnishing is superficial corrosion of the carat gold surface and is evident by a usually dark discolouration – the tarnish film. Pure gold, of course, is not susceptible to tarnishing and this property is generally not greatly reduced by alloying to carat golds as long as the gold content is high enough, i.e. about 18 carat (75% gold) and above in the coloured golds (but there are circumstances in which higher carat golds …
https://www.truefacet.com/guide/clean-tarnished-gold-silver-jewelry/
Jun 19, 2017 · How to Deep Clean Silver-Plated Jewelry Silver-plated jewelry has a thin layer of silver over a non-precious metal base. Because the silver-plating is so thin, you need a very gentle cleaning method: 1. In a large bowl, fully dilute a few drops of mild dish soap in warm water. (Undiluted dish detergent will leave dark spots on the silver.) 2.Reviews: 3
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