KeeWayKeno - I agree with Chard's assessment. It's mold.
I'd also suggest you measure the temp in your dehydrator.
There was a paper about 10 yrs back(I think from the University of Wisconsin) about consumer dehydrators, and it basically boiled down to models without temperature control and forced air circulation were not reliable. At the time, they only recommended Excalibur and Nesco/American Harvest, but I'm sure there are plenty reliable Brands/models out there now.
I tested my temps when I first got my Nesco, but I have to admit I haven't checked it since. For me, typical times are 8-14 hours, my pepperoni sticks only take about 4 hours, but that has nitrates/nitrites in it. Chili is usually done in about 12-14 hrs (dry overnight, peel off the tray, flip and back in for a few more hours).
If your chili takes 24hrs to dry, I'd be worried about how much time your Dehydrator spends moonlighting as an Incubator.
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