Hi I've doing a bit of thinking and reading on the subject of deep freezing SS, trying to figure out a reasonable set up for a hobbyist (me). It's bit of a hazzle for me to get dry ice and LN2, and I'd probably only do a blade every month or two at the most as thing are now. Different steel producers (for example Sandvik) say that you only have to reach temp and not neccesarily soak at -109 F / - 78 C. I was chatting with this knifemaker and he said he used a CO2 fire extinguisher to deep freeze his blades in CPM154, Rwl 34 etc... It seem like a rather practical way to go about it when you're only doing one blade every now and then like me (easy storage, easy refill, no messing with dryice/alcohol). I was thinking purpose built small styrofoam box for the blade, then go at it with the spray... Any thought on this? You think I'd get rid of enough of the RA in steel?