NGC Conservation: Making Light Work Of Heavy Residues

I wonder if doing the conservation work themselves makes NGC more amenable to straight grade the coin.

If you know your stuff and have some basic knowledge
of chemistry , results such as above are easily attainable
at a huge cost saving to yourself . The grading services
Charge crazy money for what you yourself can do for a very Minor cost .

Coin A . Since the reverse crud was obviously soft and not hard ,
was restored using acetone soak , then reconditioned with Coin
Care or a similar product .
Coin B .. This piece was probably given a very quick swirl in a mix
of Sudsy Ammonia and warm water .Then quickly rinsed with very Cold water . This is the go to fix for minor hazing on US 90 per cent silver Proof coins .
Coin 3 . This result is easily attained using first a light acetone soak to check for active PVC , then after it dries applying MS70 .

Hardly, if you use it right !

What is MS70?

I thought was a grade.

MS70 is a water-based caustic cleaner. It's primary ingredients (besides water) are potassium hydroxide (a strong alkali, designed to dissolve corrosion without dissolving metal or reacting with metal oxides or sulfides - so it dissolves the green stuff but leans toning and tarnish alone) and 2-butoxyethanol, which acts as a degreaser (removing PVC goo, fingerprints and the like - in effect, a slightly weaker version of acetone that's less volatile and less flammable).


Assuming you've used it properly and rinsed the coin off after treatment, there's nothing in MS70 "to leave behind". Unlike verdi-care, MS70 is not intended to leave behind an invisible coating. 2-Butoxyethanol will degrade into volatiles and evaporate after a few days in open air, so as long as you wait a couple days before sealing the coin up and shipping it off, I can't see it being "detectable" by 21st century science.

Now, if the original corrosion was bad enough that the underlying coin was pitted or otherwise damaged, and MS70 removed the corrosion that was hiding the damage, a TPG should be able to see that damage and give your coin a details grade. But that's not the fault of the MS70; the coin was already damaged before the treatment, the treatment merely let everybody see the damage.

Very interesting

That's the racket.
While what they're doing here might appear magical to the totally uninitiated, it's super trivial basic junior high school chemistry that most anyone could do competently... the catch is, they straight grade the 'conserved coins' they execute whereas the identical outcome as an external submission is often details, since the unnaturally bright surfaces and other telltale signs of cleaning they nail on a random submission are basically waved if it's via their conservation service.