Hard to say exactly, but some cutlery is magnetized because if the way it is manufactured. Heated and hammered metal may become magnetized. Or it could have been magnetized due to some jig used for holding the knife during grinding or sharpening, who knows.
To demag it you can turn on a solering GUN and pass the blade into or out of the feild that forms rotating around the arms and copper rod that makes up the loop that is the working end of the gun.
You may have to insert the knife, turn on the gun and pull the knife out and repeat or turn on the gun and the push the knife in and turn off the gun then pull the knife out and repeat depending on the polatity of the knife.
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