>Jumping in w/o knowing the whole story sorry. Surprisingly though they can differentiate 20's and 1's better than me. And more they can differentiate an imitation much much better than me just by touching. IOW I'm kinda blind at what I can see :)

The new Canadian $10 have a little braille in a corner. I expect that all the new [Canadian] bills will have that now.

And Canadian money is colorful compared to American money. $5 are blue, $10 are purple, $20 are green, $50 are red, $100 are brown, and I've never been rich enough to see higher currency! :) $2 were pink before beeing changed to coins.

All Canadian paper money is the same size. I only have $5 on me, so I can't check for difference by touch right now.