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It's true that aluminization overcomes this problem.
Potassium silicate is normaly used in the deposition of the phosphor.
Strong silicate solutions, or evaporated magnesium oxide, allows them to adjust the second crossover point to closely follow the applied anode voltage.
A B McFarlane 1957 Br. J. Appl. Phys. 8 248-252
John
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