Valid concerns fellas, and one that I share, however, since I have been reading and studying this process, I have become less concerned with mold forming during this part of the process than I am during the color-curing/drying phase. There is much more moisture in the leaf during this stage than during the fermenting stage.
Remember, the leaf has been completely dried out, including the mid-rib, before this process begins, and will only be barely "in case" when placed in the bag. When I remove the leaves each evening they will be allowed to hang for several hours, perhaps even overnight, before being replaced in the bag for the next day's sun. The action of going into, and out of case actually works to prevent the formation of mold........or at least that's what I'm told.
This is the reason I've kept some "junk" leaves and have them drying and am going to simply store some of the harvested leaf over the winter and ferment in the spring. If during the first attempt mold becomes a problem, back to the drawing board I go. There are products that can be applied to prevent mold/fungus growth.
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