Actually, since I've got a cut that I'm keeping clean right now, I did have a non-random thought.
In the long run, the purpose of poisoning a blade is to kill someone. But in the short run (i.e. in a fight) it might be equally useful to put an irritant on the blade, so that even a minor nick hurts like iodine...excuse me...blazes. Sorry that slipped out
Anyway, the flinch from getting hit by an irritant (toxic or not) might be useful in a fight.
Just a thought. Guess it shows where my mind is when I'm swapping out a bandage.
Best,
F