What solvents did you try on the "hard residue"? Is the fuel 100% ethanol?
Nailed it!
No way the sniffer has the sensitivity to pickup trace thiourea. As an analytical chemist I'd have to submerge the coin in a solution to extract...
The "sniffer" cannot detect what has been done, that's impossible. It detects things that are still on the surface. Based on the analytical...
And another thought - I'm no polymer chemist, organic is your world but... can't a chain break at the ether linkage with a little hydroxide...
Probably not the toning, I was referring more to the natural, organic-type surface layer, some call it a "skin". The slow adsorption of elements,...
The problem is not broken-down polymer removal, the right organic solvent(s) will dissolve it (THF comes to mind). The issue is that acetone broke...
Typo, welcome to the forums. You obviously don't know me yet. I do not need AN English lesson, I write technical stuff everyday professionally.
That is where the metal has been acid damaged, no removing it.
There is NOTHING left when pure acetone dissolves, you are plain wrong. As I've said a million times, rinsing with water rehydrates the coin...
You have some bad acetone!
I don't recommend it either but apparently it has it's place in the numismatic world. It is a good cleaner, a simplistic one, but effective. For...
I suspect it is due to the formation of a thin layer of copper sulfate (blue). If anyone has a copper turned blue by MS70, I could run it on our...
Acetone is by far the best way to dry coins.
You missed water, that's the main ingredient. 2-butoxyethanol - A very good, polar organic solvent. It WILL dissolve PVC plasticizer residue....
Acetone is a Lewis base, very, very weak.
Personally, I would not use the term "restoration" when it comes to coins. It implies the coin has been altered or repaired. The proper...
Acetone should not be used in an open container. It evaporate rapidly and will redeposit any dissolved residue right back onto the coin.
PVC plasticizer residue contains hydrochloric acid, it's the acid that causes the damage. Because the coin was exposed so long to the acid, it has...
Neither does the 9 nor the 4.
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