Author Topic: Black Silver PMC  (Read 245 times)

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Offline Hitesh

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Black Silver PMC
« on: September 13, 2017, 08:33:53 PM »
Hi,

Could anyone help me with the reason for my silver PMC's tarnishing to the extent shown?
And any way to reverse this? They've already been in an olive oil bath for 2+ weeks without any improvements.

The proper silver color can be judged from the silver edges on the lower right coin.
I'm not really sure about the genuineness of the left coin given it's weight is 1.71g while the one on the right is 3.32g.

Thanks!
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Offline Figleaf

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Re: Black Silver PMC
« Reply #1 on: September 13, 2017, 10:58:13 PM »
Try rubbing them after a 5 to 20 minutes bath in a 50% vinegar (or lime) solution with water. Stay with the coin and don't let the process go too far. Neutralise with plenty soapy water and dry well, preferably in sunlight. If the solution is too weak, add vinegar.

Peter
An unidentified coin is a piece of metal. An identified coin is a piece of history.

Offline Abhay

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Re: Black Silver PMC
« Reply #2 on: September 14, 2017, 04:54:42 AM »
Hi Hitesh!

Just go through this topic for a similar treatment:

http://www.worldofcoins.eu/forum/index.php/topic,22520.0.html

Abhay
INVESTING IN YESTERDAY

Offline Hitesh

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Re: Black Silver PMC
« Reply #3 on: September 14, 2017, 06:22:20 PM »
Thanks for your help!
Any comments on the left hand side coin? Does it seem fake to anyone else too?
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Offline EWC

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Re: Black Silver PMC
« Reply #4 on: September 15, 2017, 08:13:36 AM »
Any comments on the left hand side coin? Does it seem fake to anyone else too?

Genuine but rather corroded I think