In the humidor I have the two humidors inside and i have them laying on the actual wood and i noticed that some green dust has formed around it one day when i decided to recharge them because the ph has dropped. A little of it was in the crevices of the humidors and I was wondering what could cause this? When I get home I will try to take a picture of it. Do you think water getting into the wood from the humidors could cause this? Or that maybe it was holding too much water?