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Originally Posted by A. G. Maisey
Roland, have you considered the possibility that what we are looking at here is a blade with a steel core and an iron body?
The transition between the two types of ferric material will show just such a differentiation in colour.
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Alan, good question. I'm 100% sure, that we dont see an inserted cutting edge. The transition area between iron and steel would look different. Not so wide, not so even and sharper. If the back would be Iron, the result after staining would look very different to this, since Iron is much more resitant against the etchant than steel.
Until now I dont have better pictures of the temper lines because it is fresh and unfinished work.
I already read about the multistage tempering in my literature as an invention of the Ottomans. The receipe of this special heat treatment seems to has been lost in the last 150 years, perhaps it was kept as a secret.
Roland