Do TPG's stabilize a coin's surface before slabbing it?
Do they soak a coin in acetone or any other treatment? I'm just curious because if they grade a coin and then it develops unattractive spots or toning in the slab because of a foreign substance on the coin, it might not reflect well on the brand.
Need a Barber Half with ANACS photo certificate. If you have one for sale please PM me. Current Ebay auctions