I received this Argentinean Dos Centavos as part of a random world coin set and saw that it had some pretty significant verdigris. I thought this would be a prime opportunity to experiment a bit. The original coin was this: I sent it through a few cycles of my ultrasonic cleaner with distilled water and a small drop of dish washing liquid. My cleaner only runs in 2 minute intervals, so probably 30 minutes total. Lots of restarts between 5 minute cool downs - it's a cheap model cleaner. After a final distilled water rinse: Then I applied the Verdi-care. I started around the denticles since that appeared to be the majority, but then lightly spread it to the motto with a q-tip. Then I got impatient and applied it to the whole coin. I finished with an acetone soak/wash at the end, but I'm not sure that was needed. I was just looking at the scary 'if this touches your skin' warnings and wanted to sluice the thing down. I was never able to completely remove the verdigris above the D in libertad, but all in all I'm pretty happy with the final result. Sorry for the color differences, my USB camera doesn't retain the settings between runs so I had to eyeball it.
Ha, I know what you mean. I bought the smallest bottle that Wizard had and it was $14.99. However, I have to say that I didn't realize how much verdigris it actually removed until I looked at the second and last pictures. It really did an amazing job of clearing off that green...
Good conservation, I liked the steps you took. A little VC goes a long way! With experience you'll be able to complete a conservation with just a drop or two.
