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Author Topic: what kind of corrosion is this?  (Read 1044 times)

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Sebastiaan v

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what kind of corrosion is this?
« on: May 02, 2011, 11:21:20 am »
hi  :)
What kind of corrosion is this on this coin?
Is there a way to remove it?

ty! ;D
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Offline Snegovik

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Re: what kind of corrosion is this?
« Reply #1 on: May 02, 2011, 12:06:39 pm »
The red spots are cuprous oxide (Cu2O). They often cover pits in the metal and also may turn into bronze disease in presence of chlorides and humidity.
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Illegitimi non carborundum

Sebastiaan v

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Re: what kind of corrosion is this?
« Reply #2 on: May 02, 2011, 12:21:21 pm »
Quote from: Snegovik on May 02, 2011, 12:06:39 pm
The red spots are cuprous oxide (Cu2O). They often cover pits in the metal and also may turn into bronze disease in presence of chlorides and humidity.

thank you! Could I do something to to make it better?
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Offline casata137ec

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Re: what kind of corrosion is this?
« Reply #3 on: May 02, 2011, 06:28:40 pm »
Nope. As Snegovik "they often cover pits in metal"...this means that if you get rid of the pink, you will be left with a divot in the coin. Some will be shallow, others will be deep. All will detract from a decent coin.

Chris

PS It is a nice coin as is! Got a pic of the reverse?
C.
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Offline Snegovik

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Re: what kind of corrosion is this?
« Reply #4 on: May 03, 2011, 08:52:20 am »
You need to keep the coin in a dry place and check it once in a while. If the spots turn green or start expanding, a bronze disease treatment needs to be applied.
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Sebastiaan v

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Re: what kind of corrosion is this?
« Reply #5 on: May 03, 2011, 10:43:10 am »
thanks for your advice snegovik and casata ;)

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