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Cleaning Coin With Tomato

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Australia
13327 Posts
 Posted 03/29/2020  6:15 pm  Show Profile   Bookmark this reply Add Sap to your friends list Get a Link to this Reply
Metal detector finds are an example of an exception to the general rule "never clean coins". Keep them uncleaned and you might have an "interesting historical artifact", but you don't really have a "coin" - especially if it's unidentifiable as to country, denomination and date.

Acids (including tomato juice) are towards the "strong" end of cleaning agents. Acetone is towards the "weak" end, as it only removes organic "goo" and leaves the metal and any metal corrosion by-products alone. This coin was covered in green corrosion by-products; acetone would have done nothing.


Quote:
Actually, I rather prefer amonia + soap water and boil it for few min.


Ammonia and soap-water are also "weak"; I do not know how they work when mixed together and boiled. I do know concentrated ammonia alone, on copper/bronze coins, tends to leave an ugly, bright orange discolouration once the corrosion is removed. This Romania 10 lei coin is made of "nickel-brass", and so would probably also have enough copper in it to turn orange too. I think you made the right choice in going straight to mild acid.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
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Australia
16991 Posts
 Posted 03/29/2020  6:57 pm  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
, Sap has said it right for this coin.
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United States
3384 Posts
 Posted 03/29/2020  8:20 pm  Show Profile   Bookmark this reply Add tdziemia to your friends list Get a Link to this Reply
Ammonia forms colored complexes with transition (i.e. coinage) metals. This is known in the chemistry world,and might also apply in this instance.

Common acids do not.
Edited by tdziemia
03/29/2020 8:21 pm
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86430 Posts
 Posted 03/30/2020  10:16 am  Show Profile   Bookmark this reply Add jbuck to your friends list Get a Link to this Reply

Quote:
And someone had to do something to save that coin
It is better off now.
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United States
16534 Posts
 Posted 03/31/2020  04:42 am  Show Profile   Bookmark this reply Add Conder101 to your friends list Get a Link to this Reply
I think most of the "cleaning" of the OP coin was accomplished by the toothbrush.
Gary Schmidt
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