Distillate staining jar

Has anyone seen this before or know what it is? Ive been seeing alot of distillate in town that leaves the whole jar yellow. I have made thousands of liters and never had anyything “stain” the jar

notice how the whole jar is “stained” yellow even after sitting for awhile?

A very thin film of distillate stays stuck to the walls if it’s very stable. Have you tried using a heat gun on it to see if you can get it to drip down?

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