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If you mean the silvering on the inside of the glass, that is perfectly normal. Part of the manufacturing process.
It's a pump!
Adam
Yes. Not air though as you imply. Actually Oxygen I think.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
It usually barium, which reacts with both oxygen and nitrogen to help maintain the vacuum in the valve.
Cheers,
Adam
It also mops up gas released from the internal structures, for example mica used for spacers has a significant water content.
This is why valves overheating is bad as it can cause release of gas from internal structures.
The valve elements are "sparged" with hydrogen before assembly to reduce adsorbed gas too.
I know of sparging from the glorious process of beer making, but not this usage.
Cheers,
Adam