I don't have a lot of experience with this topic, but I do have experience with small knives. Having said that, the tempering of swords is usually done in the forging process I think, which would be the case because of the length of the blade. On a long blade, furnace tempering seems to be next to impossible to me and would require a very big furnace, but maybe not. I mentioned some techniques in another thread that might not be possible with a blade as long as a sword, but not having any experience with swords, I don't know. I just wanted to alert you to these facts.
Maybe someone else could contribute more information on this topic for anyone interested in sword engraving.
Ron S
Maybe someone else could contribute more information on this topic for anyone interested in sword engraving.
Ron S