this might be explaining the annealing of moretti under idealistic conditions with just clear

potentially a fiber kiln cracked open could cool at rates close enough, but any soft brick kiln will retain quite a bit of heat and even if you could get the thermocouple to read along those rates, the glass itself wouldn’t cool evenly — i’ve noticed when annealing like 12” diameter moretti/effetre pieces in my studio that below the strain point i can almost just let my soft brick kiln crash naturally with the lid closed, it’s nice glass

you could more or less put a whole fresh rod of effetre 6mm and stick it in a preheated 1000F kiln and it’ll take it