you can also try putting them in some kind of container with a lid(not airtight)
as the container will take the brunt of the temperature fluctuations and the inside more likely keeps a close to desired temp
you can also put you knives in a tray of sand for tempering. the thermal mass of the sand will help to absorb the temp swings before it gets to the blade. you will want the blade under the sand for best protection. can't find a definitive on how much sand you will need around the blade. but an 1"-2" would most likely suffice
be sure to use clean sand and something like a metal mud pan for drywall would work
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