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Ask A Scientist Chemistry Archive
name: Nancy S.
status: educator
age: 30s
Question - Yesterday, I was putting chlorine tablets in my pools' chlorinator. I forgot to take off a gold and diamond tennis bracelet that I was wearing, and it immediately turned the gold a very dark color - almost copper-looking. What can I do to restore the gold?
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Answer
Nancy,
Your bracelet tarnished because it is not (100%) pure gold. Pure gold (24K) will not tarnish and it would not be affected by the treatment it received from the chlorine pellets. The metal in the bracelet is a gold alloy that contains copper. That is what tarnished.
It would be simple to clean up were it a smooth ring. A rub with a simple jewelry polishing cloth could restore the shine. Because it is a bracelet set with diamonds, it will likely be impossible to polish in all its nooks and crannies with a cloth or buffing wheel. I suggest you take it to a jeweler and let him/her do the job in a chemical bath. They will be able to restore your bracelet without harming it.
Regards,
ProfHoff 716
=====================================================
I do not think your bracelet is gold, at least not very pure gold. It sounds like it may have a substantial quantity of either copper or silver in it, which would be consistent with a tennis bracelet. 18-24 carat gold in such a bracelet probably would not withstand the wear and tear of many tennis matches. Try a commercial jewelry polish, take it to a jeweler and have them clean it. If you do not want to do either of those some dilute household ammonia may work, but one of the first two suggestions would be preferable.
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