QUOTE(gxseries @ Apr 20 2007, 09:06 PM) [snapback]318790[/snapback]
What I tried to do is to remove the minor verdrigis - it wasn't a smart move. Now that red lusture (of the second coin) is completely stripped off - you'll cry when you see what happened to it. Bright red has become pale yellow-orange

I wouldn't want to show it either.
Perhaps the only thing that I screwed up completely is not using the highest quality olive oil and it might be the plastic containers that reacted with the oil. (should have used glass). It might be the liquid detergent too that I used to wash the containers but otherwise, I can't quite think of anything else. Yes, I did seperate them in different containers.
Moral of the story - leave it to the professionals

gxseries, I only have 5kop re-overstrikes, including a 5kop1791E:M:, two 1793EM and the 1796EM shown at the beginning of this thread. I collect only the large copper coins.
I still do not understand how your olive oil can have spoiled coins, I had a copper coin in olive oil for many months hoping that it would remove dark tarnish. The tarnish did not go away but the coin did not get harmed either. Sometimes I dip a dull copper coin in olive oil and rub it dry with a soft cloth, making it a bit shiny.
Why leave coin make up to professionals? Despite my many mistakes (each one made only once) I think every coin collector must also be a coin doctor. There are books on it. Try with inexpensive scrap coins.
If I understand correctly, the pictures show the coins before treatment.
If they look as described now, before discarding them, you may as well try the following:
1.Put them in acetone to make sure to remove any trace of fat or grease. Remove, let get dry.
2.Dissolve one or two small lumps of potassium sulfide in about half a cup of luke warm water.
3.Put one coin in it, watching it and turning it while in the solution. It will get brown. Take it out in time, don't let it get too dark. Rinse immediately with water. If the coins are as ugly as you say, you do not risk anything - but you will probably improve their looks. Good luck, Sigi