I don't know about dealers darkener, but Deller's Darkener is a mixture of petroleum jelly and sulfur powder. The stuff can do a great job of ruining copper in a short time. If you want to ruin copper immediately, try flowers of sulfur - but be careful or it will also ruin you.
Deller's Darkener, back in the day 60's/70's it was called brown shoe polish then just add a little heat to dry it up quick filled in pits/slashes, just be careful with the heat old gas stove or it will melt that beautiful AT toned 77 indian or that 09 s VDB .
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<< <i>What are the chances of a cent treated with dealers darkener being graded ? >>
Very slim if "being graded" means slabbed problem-free by a major TPG.