Need Help With Grade On A 1928 Unc Dime.

"Don't knock it until you try it". I have several proof coins that have developed tarnish spots. Some others with nice gold edging will stay like that. Here's one that had several brown areas that I found unsightly, and an overall haze on the fields (also several scratches). What to do ? Photos before (1 & 2) and after 5 second dip with TarnX (3 & 4).






VOILA !! Brown areas gone ! Haze gone ! Lustre unaffected.
Too many times or too long will eventually kill lustre. Older coins take longer and often leave them dull, but sometimes it shows hidden lustre with light or medium tarnish removed. If the coin is blue or black with heavy tarnish, the outcome is usually not good, so only do it on inexpensive coins. I did it to a 1956 silver dollar from an original set and it has a dull, brownish surface in certain light.
More tomorrow.

Acetone will kill the green. If it has started to actually corrode (the green is hard and flakey, there will be pitting where the green was. If caught early, where the green is soft and oily, it will take it all off. There may be a little darkening underneath. Acetone won't bother the bronze, unless some kind of cleaner was applied, maybe years/decades ago ... the acetone will react with whatever residual there may be on the coin ... might get some minor strange color/luster.