There was an item in "New Scientist" a few years back that said the reason paper cuts hurt more than metal cuts is paper is not smooth like metal.

Paper is composed of zillions of microscopic fibres & some stay in the cut.

Nasty stuff paper, my latest cut has healed now. It was only on the fingerpad, not the usual joint so I only swore for a short while, but naturally it hurt for a long while and kept opening every time I moved my fingers.

sandra