I've been soaking a coin in distilled water for 3 mo. with very slow results. Sometimes I wonder if the progress is just in my imagination.
This coin has a thick, hard, green coating on it. You can see part of Caesar avg on one side and faintly see SC on the other.
Will electrolysis get this stuff off? I've got it in the freezer now....see what happens.
Which is better ultrasonic or electrolysis?