There is a BIG difference between plume and mold.
The little white dots that are produce by the sugars can easily be wiped off and have no impact other than to know your sugar has a perfect age and humidity.
If you have ever been unfortunate to see mold, I haven't in my humidors but my cousin did once, they kill the cigar and usually you see other signs like greenish color and slightly swelled cigars from over moisture.
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