>>20109915Good info. I guess if the wax is in common use in the ancient market it's fine for grading companies. I see a lot of slabbed ancients.
>Pieces suffering chloride-induced "bronze disease" for example need to have the powdery crud scrubbed out and then soak in successive changes of 5% sodium sesquicarbonate solution, or at least distilled water, for weeks or longer.good to know, I have a couple high dollar pieces that have the disease and have to be kept isolated. Unfortunately the dirt I dig in is usually mine waste with either sulfuric acid, or chlorides, or both. I've pulled coins out of the ground that have turned to sponges over 140 years. They just fall apart and the best I can do for them is a photograph before they're gone.
