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Is there any possibility of air hurting a non-aluminized phosphor? I thought phosphors are essentially oxides or sulfides (specially formulated rock), so I would guess air is not going to do anything to them. (Moisture might be another issue. Maybe oxygen can hurt the sulfides or sulfur air pollution can hurt the oxides?) Have there been any expert opinions on this? Were old B&W tubes tubes ever rebuilt just by replacing the gun and leaving the phosphor alone, and did this depend on aluminization? This would be a good indication that there is no problem.
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