Made a marking knife today out of an old reciprocating hack saw blade, a brass tube and a piece of scrap paduk.  I tried a different version bolting a handle on but that saw blade was so hard I couldn’t drill through it.  I heated the metal till cherry red and tried several times with quality bits.  So I changed course and went for the tang inserted into the handle.  The blade looks blued in the pic, which must be the lighting, it’s polished to a decent mirror finish.  Good practice on the lathe for all those chisels I want to re-handle.