What would cause these spots?

The eraser material is suppose to be non-abrasive as they are designed to absorb graphite/pencil markings into the 'crumbs'. However, I seriously doubt the marks on this coin are such, so particles of the material that is causing the question, could be removed , but adhere to the vinyl and scratch the surface as the eraser is swiped over other areas. Not sure, but it seems an unnecessary chance. I suspect water may have been tried, but 90% alcohol from Walmart would be my second try, then acetone, and after all fail, a 1:10 dilution of Ez-Est :water dip. This slows the reaction down and doesn't easily overshoot the endpoint. It looks shallow, like a stain to me.

 

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This is a quote from one of my previous post on this subject.

" I have removed "carbon" spots with an eraser. Never use pink rubber eraser though as most have abrasives in them, namely pumice. The white vinyl works fine though. If you use a draftsman's eraser shield and use a hole the size of the spot, you would have to know exactly where it was to find it. On a blast white coin, you can't, but on a toned coin it leaves a clean spot, more the reason for the eraser shield."

 

I understand what they are saying and understand why they are saying it. In my opinion, a black carbon spot on a coin, if it hasn't damaged it already, will soon enough. Eye appeal alone has significantly dropped its value. The same can be said of dipping it in an acidic solution. I had much rather have a coin where you may or may not see where a spot was removed, than a coin that's entire surface was stripped. I bought a MS 64 Peace dollar from a member on here, that because it had developed a carbon spot under the slab, he was willing to sell it below cost. I removed that spot and there is not a single collector on this board, other than he and I, who can find where it was.

 

How many more will know that it has been dipped?

 

Wasn't there a black & white movie made in the 1950's, starring Bela Lugosi, about a mad scientist attempting to clean a coin? I may be mistaken.

 

If anyone would know here it would be @willieboyd2