verdigris(?)spots on NGC indian cent
I sold my ms65 indian cent on BST. Buyer noticed tiny spot of near the denticle on obverse, so is returning it.
I'll relist it on BST, and note the spots...
This is the photo I took before I sold it:
Buyer has better eyes, and took better picture, and notes these spots, which he thinks are verdigris.
This is NGC coin, MS65 RB.
- I understand that PCGS will spot clean and reslab coins, if you pay for shipping both ways. Does NGC have something similar?
- Is this verdigris? Carbon spot of some kind? Other?
- How much would I expect such spots to lower the value of the coin?
- Other than keeping this coin in a low-humidity environment, what else could/should be done for it?
Thanks... I know very little about copper...