Coin Show Etiquette

This question is for dealers. I am a novice collector. When I attend a big show like Baltimore, I get to see my trusted friend/mentor/dealer. One of the fundamentals I struggle with is determining original surfaces. In looking around at the various dealers' wares on the bourse, I sometimes come across what I think is a nice-looking, RAW coin, but I'm never sure of whether it has been dipped/cleaned, etc. What I would like to do is show such coins to my dealer friend at his table, because I trust his assessment. But, I have never asked a dealer to allow me to do so (and say leave my driver license or other item as collateral), because I've feared that it might be perceived as bad etiquette. With that in mind, would you consider such a request insulting because: 1) dealers don't like the idea of you asking other dealers what they think of their coins; or 2) as a stranger/customer, you should never presume to be trusted by a dealer to even briefly take his/her wares out of their eyeshot. Thanks.
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Comments
Steve
of those situations that depends upon the dealer, the coin, and other variable. Lets face it, some dealers
are really nice and helpful and some are just plain cranky a$$h*les.
<< <i>Before attending....take a bath
WTF?
Vietnam Vet 1968-1969
Dealers - your take on this?
==Looking for pre WW2 Commems in PCGS Rattler holders, 1851-O Three Cent Silvers in all grades
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Doggedly collecting coins of the Central American Republic.
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Have you ever et-i-quette? Tastes like chicken.
Ren
<< <i>... Lets face it, some dealers
are really nice ... and some are just plain cranky a$$h*les. >>
With all due respect...
...I think the same could be said of collectors...
One alternative is ask your dealer friend to visit the table and check out the coin at the other dealer's table.
But if you're not serious, don't ask.