12-05-2007, 11:18 PM
If the corrosion on the copper alloy coins is stable it's a better idea not to remove it... You would remove the protective patina and open up the way for oxygen again, which will result in new corrosion of the healthy metal and even more loss of material...
Do not have them cleaned by heating them and then dipping them into acid (a lot of platers still use this technique). Fine detail will be lost this way...
If you mount the coins (which might be risky IMHO), be sure to use a non-reactive material... Best not use regular cardboard (the acids in it will damage the metal), nor wood that has been treated correctly. Most wood will spread corrosive organic vapours.
Valete,
Do not have them cleaned by heating them and then dipping them into acid (a lot of platers still use this technique). Fine detail will be lost this way...
If you mount the coins (which might be risky IMHO), be sure to use a non-reactive material... Best not use regular cardboard (the acids in it will damage the metal), nor wood that has been treated correctly. Most wood will spread corrosive organic vapours.
Valete,
