Methods for getting rid of artificial deposits on coins

The coin I'm working on definitely has an artificial substance glued to it:
But how to remove it?

 

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After short soaks in acetone, I also scrub with a nylon brush. I use a denture brush as it has very tough bristles and will not scratch the coin. Try to alternate a few short soaks and scrubs with brush.

Below is a picture of one of these coins. Top is before and bottom is after some soaks and scrubbing. There might be some fake patina left, but I believe that most of what is left is actual desert patina.

 

But if you paint it to hide rust problems, I would consider it fraud.

 

TypeCoin may be on to something, eh? ...

=> if you can't clean it, then jazz it up!!?



=> tag that dawg!!






... just jokes ...

Smeag => I wish you luck trying to finding the correct antidote, my coin-friend!

 

UPDATE: Soaking the coin in alcohol for an hour doesn't work.

Any other ideas @TIF ? Or could these encrustations be *gasp* natural?

 

If you haven't tried mineral spirits, that would be my only other suggestion. If the deposits don't loosen easily after all of those solvents, I'd be inclined to say the deposits are "natural".

 

Unless people are smearing wet concrete on coins, I would be inclined to agree. Not sure what adhesive based mixture you could apply that a strong, organic solvent like acetone would not remove. I have heard of people mixing dust and superglue to smear on, but acetone should remove that as well.

Metal based corrosion deposits (that could be ancient) would not dissolve in an organic solvent. There could have been a base of natural adhesions that got covered in colored goop.

 

Haven't tried mineral spirits. So that's the next line of treatment. I'll let you know how that goes.

 

acetone is a stronger solvent than mineral spirits.

 

Removing the stuff is easy.

Removing it without totally ruining your coin is a different matter!

 

I haven't scrubbed with anything that might damage the coin. I'm pretty sure u could remove the stuff with a chisel.

 

I would use a bamboo skewer, flat end, and try to crush deposit at it's highest point. Then the sharp end. Then move to a scalpel under magnification with the same technique. Then I would either cry or rejoice at the outcome.

 

Ummmm, what ruler do you want it to be?

 

Haha I LOLed