1916 Mercury dime-should it be dipped ?

I just bought an old whitman folder of mercury dimes and they are almost all black. Would a quick dip help or hurt them ? Would it matter if this coin had a D on the reverse ?
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Comments
Beyond the grunge, it is nearly FB, and has lots of good strike detail. I can't tell much about the overall originality of the luster or fields because of the stuff on it.
If it's really blue, it could be just fine for some collectors...
Dipped, original, or not, it is a very nice coin!
K S
Total Copper Nutcase - African, British Ships, Channel Islands!!!
'Do not meddle in the affairs of dragons, for you are crunchy and taste good with ketchup'
Experience the World through Numismatics...it's more than you can imagine.
When we are planning for posterity, we ought to remember that virtue is not hereditary.
Thomas Paine
President, Racine Numismatic Society 2013-2014; Variety Resource Dimes; See 6/8/12 CDN for my article on Winged Liberty Dimes; Ebay
Heads
Tails
Aldous Huxley
Yabba dabba doo.
Fred Flintstone
It is an attractive original coin.
Brian