11/30/2020
I forgot to take more pictures, but the heat-treating was a brilliant success. The secret, at least for me, is low ambient light and patience. I'd lay the blade on flameless, orange-white hot coals, flip it like a burger until it's the same yellow-orange color along the entire blade, then set it about four centimeters away from the coals until it cooled to a black color again. I'd repeat this a few times with each knife.
After that I'd heat a blade to the same yellow-orange color, tap it with a magnet to make sure the atom polarity had been randomized, then shove it into pre-heated vegetable oil and leave it dangling in the oil for five minutes.
I've found that this produces a straight, uncracked blade that a file will skate across. This works for 1095, 1085, rr spikes, industrial lawn mower blades, and 5160.
All that's left now is to temper and sharpen these 3 knives.