Not been able to find this link on here but found this today. From an Estonian University by the looks of things, lots of trials on various methods of cleaning silver and silver alloy coins. Looks like one of the best solutions is dilute vinegar.
Lasers are not recommended!
http://www.jcms-journal.com/article/vie ... 1021204/70
Coin cleaning article on semi silver coins
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f8met
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STIG
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Interesting, thanks for posting. 
Dirige Deus Gressus Meos. ' May the Lord Direct my Steps '
Etrac and Tons of Gear
Gold = 1
Silver = 14
Hammered = 1
Bronze = 1 Ring
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Etrac and Tons of Gear
Gold = 1
Silver = 14
Hammered = 1
Bronze = 1 Ring
Copper = 132 Coins
Musket Balls = 53
Bag Seals = 23
Artefacts = 7
Jetons = 1
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Christoph1945
Many thanks for posting that; I found it to be most interesting and informative.
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mathewbarrett
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Excellent information here, thank you for posting it. Should answer anyone's question of how to clean those yellowed silver alloy coins.
Garrett AT Pro
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geomorphicmat
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just to clarify, the recommended treatment is a 10% dilute solution of acetic acid.
Vinegar is already diluted to around 6%. This should therefore work OK but will take longer to clean.
Can I suggest that the distilled (clear) vinegar is selected and the Malt vinegar is kept for your fish and chips!
All the best and Happy Christmas.
Matt
Vinegar is already diluted to around 6%. This should therefore work OK but will take longer to clean.
Can I suggest that the distilled (clear) vinegar is selected and the Malt vinegar is kept for your fish and chips!
All the best and Happy Christmas.
Matt
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