Theoretical Question on knowing a marked card

[Abbaddabba]

There are many ways to mark a deck and get away with it, though i wont discuss all of the ways here.

I've never tried this, nor is it likely that i ever would - but it's interesting to consider.

There are substances that can be rubbed onto surfaces that are invisible to the naked eye, but that can be seen under ultra violet lights, and/or specific lenses.

If you could work such a lense into a frame of shades and have a small cannister of the invisible substance in your pocket, you could easily give yourself a huge edge.

For instance - you could mark one corner for all kings, two corners connected by width for queens, two corners connected by length for jacks, two opposite corners for tens, and a dab im the center for aces.

Very easy to read, very easy to mark and very difficult to detect, unless you're trying it at a casino with extremely detailed security features.

The only problem would be that you rarely see cards often enough before it is reshuffled to have complete information of the deck. Obviously it's a lot more viable at home games where you have access to the deck before hand.

You'd have to be a pretty big prick to try this at home games though... and a pretty big idiot to risk getting caught doing it at casinos.