Aqua Man
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Hard to say. Kinda looks like crusty dried milk. Humidity does not cause PM that's kinda BS just passed around. Condensate does and humidity when the lights go out can spike because... Well.. relative humidity. It's relative to temps. So when the lights go out and the temps drop you can hit the dew point (saturation point) and water will condensate. Like on a Slurpee cup. The cold air around it drops the air temp immediately around the cup and it reaches the dew point and boom you have condensate. That thin layer of water is ideal for PM to propagate and you have a problem. ,