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 zinc oxide + silver = instant tarnish???
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| Author | Topic: zinc oxide + silver = instant tarnish??? |
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seaduck Posts: 350 |
posted 11-01-2017 08:42 PM
  
A few days ago, a freshly polished trophy was presented to some sailors at our yacht club right after they had been racing. Our trophy committee saw it two days later and we were shocked at the appearance. There was tarnish -- the sort of light tarnish we expect from a few hours exposure to salt air. But more than that were the yellow/orange smudges from fingerprints. I was able to polish them out of the trophy, using TarniShield. But one of our members was using Weiman's on the sterling engraving band on the base. It looked better, but she wasn't able to really polish them out in the limited time we had. We are trying to figure out what might have caused this. Someone suggested that the sailors might have had sunscreen on their hands, which led someone else to say that she had heard that zinc was a problem with silver. Would anyone here know if zinc oxide or titanium oxide (or any other common ingredients in sunscreen) would be a problem? IP: Logged |
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agleopar Posts: 850 |
posted 11-03-2017 08:01 PM
I love the question and would like to know too? But I have never run across any mention of this... It is a new situation, the only possible previous I can think of might be skiers back in the day. Perhaps a test? Sun screen on hands - handle silver wait... IP: Logged |
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seaduck Posts: 350 |
posted 11-04-2017 09:53 PM
Hmm. A controlled test might make sense. Do you think it would make any difference if we used a silverplate piece we don't care much about as opposed to sterling? The weird thing is that we haven't noticed this before. Most trophies are presented in controlled settings -- a dinner where people get cleaned up. But a good number are presented after a weekend regatta on a Sunday afternoon when everyone is in a rush to get outta Dodge. Tracking everyone down who handled this piece is theoretically possible, but I doubt we could find who was wearing what sunscreen...without the benefit of an NCIS badge. IP: Logged |
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Polly Posts: 1970 |
posted 11-05-2017 05:05 PM
It could be a combination of sunscreen and sweat? IP: Logged |
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seaduck Posts: 350 |
posted 11-06-2017 07:19 PM
The salt in sweat sure wouldn't help. What's weird is that this tradition has been going on for years, with lots of trophies handled by people using modern-era sunscreen. There may be no answer without talking to a chemist. But I'd sure like to find a polish that will take it off easily. Weiman's and TarniShield are our two current faves, and I'd like to try TarniShield on it. The problem is that the engraving band is on a wood base/plinth, and you have to use water to rinse it. IP: Logged |
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Scott Martin Forum Master Posts: 11520 |
posted 11-06-2017 09:45 PM
TarniShield doen't really clean the tarnish away. It kind of changes the color of tarnish. Eventually you will need an abrasive polish to remove the dullness TarniShield leaves. At least this has been my experience when trying TarniShield. IP: Logged |
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