Spunjer;
Have another idea, I just did an Iron filling test on a dagger I just got see;
http://www.vikingsword.com/vb/showthread.php?t=4979
Why not try it on your blade? If there is energy emitting form the blade I would think it would have an associated magnetic field around it as well. You might want to test it with a compass ( I have a good supply
first just to see if it would change directions.
Gene