It puts out the least amount of ink, which keeps it from bleeding into the FRNs' fabric-like paper. Some idiot typed on the back of this bill. This guy must not have noticed. Finally, I try to use a slogan that will be framed nicely within the light space on the back of the note. I like to use only twenties and smaller.
Cashiers inspect fifties and hundreds for genuniness due to their rarity and value.
Small bills attract the least attention. Strike your own balance between passing as many Liberty Bucks as possible and not getting caught with a wallet full of them. Defacing money is a federal felony. But I got it from an ATM, so I figured if it was good enough for the bank, it's good enough for me. Whenever possible, I like to mix one or two Liberty Bucks in with a group of unaltered FRNs.