Help me to save a rarity - proper xylene usage instructions

The Southern Italian King on this coin was "Ferdinando IV di Borbone" and he was the son of King Charles III of Spain. Next to him is wife Maria Carolina of Austria. He ruled what was called the "Kingdom of the Two Sicilies". This coin was minted at the Napoli mint and was .833% silver, weight 27.53 Grams.
This was a coin minted for use in Southern Italy, Sicily had it's own coinage minted at the Palermo mint.

 

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First off, you're vastly over-estimating the rarity of this coin.

What you have is a cleaned coin that had started to retone. Looks like there was some PVC residue that PCGS caught and in your removal or it, the cleaned surfaces shined.

I know people here will scream, but you might as well strip the surfaces and let it retone naturally.

 

Hi Greg, respectfully, I strongly disagree on your first point. Take a look at archives and tell me how many examples of this coin you see let alone with this level of preservation (cleaned or not). Most examples out there (when they do come across - which is not very often) look like this:



This a PCGS VF30 graded example mind you... this is typical of what one sees - smooth/flat devices.

Higher grade examples are EXCEEDINGLY rare.

Now this is my coin and I know everyone thinks their coin is the best, problem free example out there and would easily grade MS65 but I'd like to believe I'm a bit more realistic. I can't tell just yet what the surfaces truly look like but from the few areas I gently wiped with a Q-tip... I see "life". Some would argue my wipe polished the coin... I strongly doubt it but I can't say without a doubt that didn't happen. The jury is still out.

I just managed to get a hold of a nice 1 gallon can of Sunnyside Xylol (xylene) - it was no easy feat. Apparently Xylene is restricted/banned in NY and is not sold ANYWHERE one would typically look.

I'll give it a nice long dip in xylene and see what happens.

If nothing, next up would likely be VC and if that fails... likely off to the TPGs it goes. Using acidic cleaners is just not even a consideration. Had this been a $50 coin, I'd say sure, why the heck not.