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People see the reds very differently my steel is overheated by the time i see orange... and the camera sees orange whilst i see red... or is it the other way round...

O2 is just about eutectoid......

Recalescence if i understand correctly refers to the reverse temperature shift at the phase change...

In a fire you must indeed let it (shadows) JUST disappear... because once the phase changed...

What makes you worry about recalesence?

Have a spray bottle with water handy... an apron and wet the belt thoroughly before every pass and focus dont let the blade stand still

It is fun... i am envious of the forge you have... but first i want an oven...

P.s. i dont go higher than 350deg on the kitchen oven and only for 30mim twice and i quench in water between heats... we are dealing with thin sections... they dont need two hour tempering cycles...

O1 is actually quite a complex steel to heat treat optimally...my own efforts in it was met with mixed success, as O1 is very sensitive to overheating. I also see orange the moment the shadows...

If you got carbide banding the steel wouldnt really harden...and that would explain the burr easily. but that requires disasterous overheating during forging and or heat treat... on hypefreeblades...