Polish L-guard sword: restoration project

[Evgeny_K]

Originally Posted by ariel

I have already expressed my view on the extent of restoration.
Now, the question.

Heating rusted metal as described is obviously fine for the rust. But what about the metal hardening and tempering? Also, the blade acquired a dull, dead sheen. Is it correctable?

I think that this method can be applied to objects that are in very poor condition. In my case, a sword has not lost springiness (I'm not going to use a sword for cutting). The surface is dull because of usage of molten paraffin (for conservation).