re: Making a knife sharp again.

That sounds like it worked out for you .
Way back when I apprenticed and did a little blacksmithing we would heat the steel and then cool it in water but then slightly heat it again to certain colours depending how hard we wanted it but that was in the old days , Today there is so many steel alloys that it is hard to figure out what method to use .
Anyway enjoy your improved knife and do some carving .

Klaus