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https://www.myirishjeweler.com/uk/guides/jewelry-education/why-sterling-silver-turns-black-or-green/
Make-up present on the skin or clothing is the most common cause of blackening or smudging. Cosmetics often contain chemical compounds which are harder than the jewellery itself. These compounds can rub off very tiny particles of metal which appear as jet black dust. Solution: Use a silver cloth to polish your jewellery.
https://www.reference.com/world-view/sterling-silver-turn-black-d1ebbaafb8ee334d
Aug 04, 2015 · Sterling silver turns black or tarnishes due to a chemical reaction caused by contact with sulfur or hydrogen. Some foods or everyday items containing sulfur can cause tarnishing, but even polluted air can turn sterling silver black. Pure silver does not tend to tarnish.
https://www.quora.com/Why-do-silver-ornaments-jewelry-turn-into-black-color
Although atmospheric contact does contribute to discoloration of silver, it is the purity of silver that is more responsible. Jewellers mix zinc to silver and have consistently propagated that good silver will always turn black over a period of time. This is far from true and I regularly use several silver vessels (over a few kilograms).
https://storiesofsilversilk.com/sterling-silver-ring-turning-black/
Jan 31, 2018 · Make-up on the skin or stained on the cloth is a common cause of smudging or blackening. There are chemical compounds present in cosmetics which are comparatively harder than the silver jewelry itself. These compounds rub off the tiniest particles of metal which come out as jet black …
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