On Fri, 10 Dec 2010 16:11:41 -0600, Richard J Kinch
wrote:

What is this stuff? I've found exactly one secret knot that won't pull
apart for tying ends together. Try it.

What might that knot be, pray tell -- and why would one need a bend
for dental floss?

My candidates, if I had a bit of this stuff to play with, would be:
hunter's bend
blood knot
nail knot