Saw this on the Active Response training blog. I tried this on a few knives that I own and the results were interesting.
http://www.activeresponsetraining.net/weekend-knowledge-dump-october-28-2016
http://www.mdtstraining.com/test-your-tactical-folding-knife/
http://www.activeresponsetraining.net/weekend-knowledge-dump-october-28-2016
http://www.mdtstraining.com/test-your-tactical-folding-knife/