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Posted 03/23/2015 1:42 pm
Well, you've spent seven years here teaching me to respect your eye so this is something I immediately have to think about. 
From my standpoint, I've washed coins which then easily made their deserved PL from a TPG, and never seen the slightest effect on perceived luster. I wonder if there might have been a very light layer of some sort of oil on the coin? It's conceivable that something could have dried on it which wouldn't feel oily to you. That still doesn't seem like it would fool an experienced eye, though.
From my standpoint, I've washed coins which then easily made their deserved PL from a TPG, and never seen the slightest effect on perceived luster. I wonder if there might have been a very light layer of some sort of oil on the coin? It's conceivable that something could have dried on it which wouldn't feel oily to you. That still doesn't seem like it would fool an experienced eye, though.
