I think this is a great idea but I think it has it's limitations. One problem that I have had is
that in low light situations (where I typically perform) the impressions of the card on the
fingertips can be quite difficult to see. I've had many people who simply didn't understand the
effect because they couldn't see the impression. I've also played with this effect with a friend of
mine and for some reason, his skin seems to show the impression much better then mine so I think it
depends a lot on your skin. All in all, I think it's a great idea but I have not found it practical
for me.