To answer a few questions. The green showed up on several coins stored. The brown, I think is dirt, but I don't know. The coins were put in storage, we believe about 70 years ago. We don't think they we touched until 1 year ago, when located. If it were dipped it would have had to have been over 33 years ago (not 5-10) as we know they no one alive had access to them for that period and we don't think anyone accessed them since about 1942. I do appreciate everyone's experienced judgment. Very interesting comments.
Also, I have heard of dip, but neither know what it is or what it's dangers are. Comments would be appreciated. Must leave.
WOW! A lot to discuss about dipping/cleaning. Search, dipping cleaning coins, on CoinTalk and you should find more than you may want to know. If you're interested, I'd also suggest searching, coin storage, for proper ways to avoid PVC, as well as other types of damage.
Don't use any type of dip unless you understand that it can kill most of the value of your coin. Dip is an acid that eats the surface of the coin. Few coins can be helped with this method. Knowing the coins that can be helped is the tough part and takes much time to learn. Acetone is not an acid. It only removes organic matter from the surface of the coin. It's safe with silver and questionable with copper coins. As safe as acetone is with silver, what's under the stuff on the coin may not look any better. Small hits and scratches will be more visible. There is much to learn if you plan to clean your coins.
Not true. Not even close to true. The softest cloth in the world will absolutely leave hairlines on a clad coin.
As for the brown, my guess would be that the coin was dipped long ago to remove heavy brown toning. Again I'm guessing, but the green looks like it might be PVC residue from the coin being stored in a PVC flip at some point. If it is PVC, acetone will safely remove that.
Cotton or cotton cloth itself is too soft to scratch a coin, HOWEVER the troublemaker is dust. A significant amount of common household dust is silica, and silica IS harder than the coinage metal. The scratches "caused" by the cloth come from the cloth capturing the silica grains and dragging them across the coin like sandpaper.
It was not stored in a PVC flap, although it looks like it. It was in a tattered roll that said FRB in Dallas with other 36D. This person hoarded silver; I think because of fear from the depression and then WWII. I don't think she was ever a coin collector in any form.
Looks to be PVC residue, soak it in acetone for a couple of hours and, if needed, gently prod the residue with a toothpick while the coin is under fluid.
Yeah, PVC residue can do that when it dries out sufficiently. But you do you realize what PVC residue is ? It's an acid, and it eats into the coin damaging the coin when left there. So leaving it there is not exactly the best thing to do.
I'm almost certain that it's not from a coin flip as the individual just took money from the bank and hid it, but I suppose it could be from another source.