I am starting to work on some Grey Knights for my Grand Tournement army, I want to do a departure from the usual power weapons you see. I am thinking more in line with the heat hawks from Gundam with the blade of the Force Halberd going from metal to dull red up to white hot on the very edge. I would like any ideas on how to do a smooth transition between the cooler metal and the heated part. Any Ideas would be greatly appreciated