I'm using two knives to test this. The first is a the little green handled lockback that I recieved as a door prize at the Ducks Unlimited banquet. It has "440 STAINLESS" laser engraved on the side of the blade. The second is the little all-stainless skeletonized knife which has "STAINLESS STEEL 440" stamped into the side of the blade. I am using a FireSteel from
www.firesteels.com. I get a similar amount of sparks from the knives as I get from the FireSteel Striker that came with the FireSteel. I suppose it is possible that both of these knives
could be mis-marked, though I would be a bit surprised.
http://i78.photobucket.com/albums/j1...nik/knives.jpg
I think the critical matter is the sharpness of the back edge. If it is rounded at all, it doesn't want to work. But as long as it has a good, flat edge you can get sparks pretty easily.