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All Glass CRTs usually have a conductive black graphite coating on the back of the bell called aquadag... Sometimes it dries up and flakes off with age/bad storage conditions.
On Zenith's with above chassis terminals you want to clean off every speck before power on or things could short and burn up. Best thing to do is remove the CRT, clean off all the old loose dag, mask off the areas that aren't supposed to have a dag coating, and spray on a new coating of Slip Plate to replace the old coating/seal the old coating where it wasn't yet peeling.
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