In some CRTs the aquadag coating performs a third function, as a filter capacitor for the high-voltage anode supply.
2.
The high-voltage supplies for CRTs often use voltage multipliers with the final-stage smoothing capacitor formed by the interior and exterior aquadag coatings on the CRT itself.
3.
Since then better methods have been developed-you might like to research the Atkinson & Wein process and CU-EDTA . You could do a patent search on PTH . You could also consider " aquadag ", which is a " paint " comprising fine carbon particles mixed in a water soluble binder.
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