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Old 6 May 2019, 03:03 PM   #26
MTBer
"TRF" Member
 
Join Date: May 2018
Location: USA
Posts: 537
18 karat gold is around 10% copper. If copper is oxidized by chlorine to copper (II) chloride anhydrous, the result is a brown color...which, when combined with yellow gold, would probably look red-ish.

If something like this really is what happened, I hope at the very least it shuts up the snide nitwits who mock anyone for asking whether it's safe to perform a given activity while wearing an expensive watch.
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