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Platinum ring NEVER turns black. Only sliver rings turn black.
Iron(II) carbonate [green] to Iron(II) oxide.
maybe due to hepititis or liver function was not ok!
Too much iron in the water
Brown horses get older and suddenly turn white not so sure black hoses.
Iron in your flask or iron nails in the distiller's barrel can in time cause whiskey to blacken.
Yes, iron can change the color of your stool. It will generally make it appear a bit darker, almost black at times.
No it will not rust as it doesnt have iron in it, but it may corrode and turn black over time
Besides being expensive, gold is a very soft metal, so it is mixed with harder metals to make it suitable for earrings (also gold coins, cuff links, tie clasps, rings, toe rings, navel rings, and just about everything else made from gold). Nickel is often used, and it turns black from exposure to the air, which is why an old nickel coin turns black. The gold itself should not turn black.
Too much iron in a pool can cause things to turn black. Speak with your pool shop about the right treatment.
My rings turn my skin black when I use a particular soap or hand sanitizer at work. When I use the soap at home, it doesn't cause a problem.
The caterpillar is mainly orange with black rings is a Seirarctia Echo caterpillar. This caterpillar will turn into a Echo Moth.