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I am curious if the bandsaw blades can be used for forging? These days, many of them are bimetal, with a soft core and case hardened only, just like cheaper files. In that case they may not be that...

Usually I forge a triangular wedge, and leave the edge thickness at something between 1/16 and 1/8.
that gives me room enough to grind straight without having to grind more than is necessary.
...

How is that? You can always make it flatter. And if you make a rectangular billet, you hammer the blade portion of the billet wedge shaped, no?

You will not run out of things to learn how not to do :)
I know I haven't. :D

I wouldn't. But if you'd use kerosene as a flux, then
a) it has to be stored somewhere, and chances are people would keep it near the place where they use it, and
b) if you use it as flux, sooner...

That is a valid consideration. However, since the borax also helps improve contact between layers, it certainly helps.
Most smiths I have talked with use borax even in gas powered forges.
It is...

All other things aside, I would not use kerosene, because having kerosene near forge fire is not the safest thing.

Usually, borax is used for fluxing metal.
It is something that is cheap and easily available, white powdery substance.
You apply it with a spoon or sprinkle it on top, and it melts onto and in...

That said, It might be fun to give it a try. Cable is cheap :)

I expect that it all depends on the quality of the cable. There's some stuff at the local diy that would probably fail to harden . However, if the Smith knows what he is doing, I expect the cable...

I have seen it made in a youtube video. I really don't know.
It would need more than 0.6% carbon at the least.