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Now make sure you first place your finger on the coin so it doesn't move while hitting it with the hammer. Never use a ball pein type hammer since the rounded end could slip off your finger and hit something valuable. 
Posted 09/26/2014 7:17 pm
The first coin is a goner. When silver toning progress to black, it's too late to use a acid-thiourea dip. If you do, the coin will clean but dull and lifeless.
The second coin has heavy verdigris which cannot be removed without revealing surface damage underneath. VC will NOT remove heavy verdigris, it's not designed for that. However, it will remove the light to moderate traces on the coin. I would soak that in VC for 24 hours (bad side up). At the end of the soaking period, use a toothpick WHILE THE COIN IS STILL UNDER FLUID and see if you can get some of the heavy verdigris off. While I doubt you'll get the heavy stuff off, VC will at least arrest the corrosion process so it doesn't keep eating away copper.
GOOD LUCK and post some after pictures for us.
The second coin has heavy verdigris which cannot be removed without revealing surface damage underneath. VC will NOT remove heavy verdigris, it's not designed for that. However, it will remove the light to moderate traces on the coin. I would soak that in VC for 24 hours (bad side up). At the end of the soaking period, use a toothpick WHILE THE COIN IS STILL UNDER FLUID and see if you can get some of the heavy verdigris off. While I doubt you'll get the heavy stuff off, VC will at least arrest the corrosion process so it doesn't keep eating away copper.
GOOD LUCK and post some after pictures for us.
