Badthad- Verdicare On Gold Coins?

Gold has copper impurities and can technically develop small spots of verdigris. Peronsally, I have never seen it though. I would be very curious to see the outcome. Can you post some close-up pictures for me?

I would imagine that lower percentage foriegn gold would be more likely to develope verdigres than 90% US gold coins.

Update. Last night under lighted magnification I took a needle and the green stuff just fell of cleanly as soon as I touched it. In about five minutes I got rid of all of it without touching the gold.

I definately would not have recommended that method. Do not use metal implements on coins. The chances of damage are very high, especially on a soft metal like gold.

The best way to address it without VC would be to put a small drop of distilled water over the spot forming a dome. Allow it to sit for a minute or two, then use a toothpick or, even better, a thorn to physically remove the surface debris. Also, when done, you should rinse the coin with acetone and put it into an airtite holder to keep the corrosion from reforming.

If was PVC, you should have used acetone on it. PVC residue is easy to remove. The verdigris component usually comes right off with the plasticizer. The only problem is when it's on there too long, a pit will form. If you haven't yet, I'd still give an acetone soak so, if they do grade it, it's not eating away at a microscopic level while the coins sits in a holder.