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1. The aluminum covers the front half of the "bell". It doesn't extend to the gun area. It covers some of and is connected to the interior aquadag.
2. It certainly is reflective, that is the whole reason for it to be used originally, to reflect the light that would have been wasted by going into the inside of the CRT. That brightened the picture. Not needing a ion trap was something that was realized later.
3. Good question. I'm not sure.
4. No solvent. An acid is used to remove the aluminum when tubes are rebuilt.
5. Except for later tubes that have a compression band, the stress in the glass is removed when the vacuum is released.
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