Question for the IHC collectors

Nickelchaser

I just picked up a nice 1909-S VG IHC. No problems on the coin.
My question is that there are a few small areas on the periferal of the coin that have
what looks like a light green patena. Is this a natural occurence for copper
coins or is this something I should nip in the bud if I plan on keeping the
coin for a long time?

Thanks for any help
Brian

littlewicher

If left untreated, it could possibly spread. I'm not sure if NCS restores coins with it.

darktone

Nickelchaser-being green it could be PVC or verdigris( a type of corrosion) or some times the green is a waxy type substance. Can you post a picture of it?
mike

Nickelchaser

Nickelchaser

darktone,
sorry I don't have a scan of the coin but it seems to be the best way to
show the problem rather than describe it. Can anyone recommend a digital
camera in the $300-$400 range that can take nice close ups of coins.

Thanks

shylock

Brian -- if it looks similar to the small green spots at 8 o'clock in the denticles in this IH I believe it's what Darktone refered to as verdigris -- the same green copper carbonate you see form on copper roofs or pipes. It's very common on circulated copper, and in very small doses I wouldn't worry about it in the short term. Consider it certification that the coin hasn't been played with. I don't believe this is something NCS or other curators can remove safely since it's a chemical reaction that becomes part of the coin, unlike light PVC that only rests on the surface. Others here may be able to give more experienced advice in this area.