found this but I have also heard that the oven works for lowering the RH but don't know the temp or time.
If the RH is higher than you like, you can lower the RH of the beads by placing them in the refrigerator for an hour. This relies on the fact that the RH in your refrigerator is around 45% RH (assuming the refrigerator is working properly). The beads will always work to assume the ambient RH (the RH in the area surrounding) regardless of whether they are in the humidor or refrigerator or out in the room. When reconditioning your beads to a lower RH, the ambient RH has to be lower. If the room ambient is less than 5% lower than your desired set-point, do not use it, use the refrigerator or freezer as instructed below.
When the refrigerator is not working well enough, or you wish to make big changes fast, you can put the beads on a plate and place them in the freezer for 25 minutes. SET A TIMER!!! If you freeze the beads, the water in the beads may freeze, expand, and destroy your beads. We do not want that. Odds of it happening are slim, but it can.
After 25 minutes take the beads out of the freezer and place them in a Ziploc™ freezer bag with your hygrometer. Let the bag sit for 24 hours, note the RH, and repeat the process if necessary. It is always best to test your beads with this method before doing any reconditioning at all. If the beads show a lot higher RH in the bag than when they were in your humidor, it will tell you that your humidor is leaky. It is how we will expose that sort of thing if we ever need to troubleshoot.
