Posted 10/31/2010 01:18 am
I have removed heavily encrusted verdigris (variable copper hydroxycarbonate) off ancient low value coins. Remember that heavy verdigris has corroded the coin's surface, just like rust attacks iron or steel. Obvious damage is usually observed under the verdigris after removal. This is the reason that justifies a method which even I consider controversial and is a desperate last measure.
I use an ordinary steel pin to remove verdigris, but ONLY in the situation above. The method is to place the point on the highest part of the verdigris and just apply pressure until the verdigris just flies off. Hundreds of pin pressure points may be required.
Patience is not only a virtue, it essential in this type of process. You will also need a powerful jeweler's loupe to free your hands. Be careful not to stress your eyes too much.
I have not enough nerve to try this on more valuable coins.
I use an ordinary steel pin to remove verdigris, but ONLY in the situation above. The method is to place the point on the highest part of the verdigris and just apply pressure until the verdigris just flies off. Hundreds of pin pressure points may be required.
Patience is not only a virtue, it essential in this type of process. You will also need a powerful jeweler's loupe to free your hands. Be careful not to stress your eyes too much.
I have not enough nerve to try this on more valuable coins.
