Hmm. What about helium? You can buy it at walmart for filling party balloons.
(I like rule #1 the best![]()
Helium is too expensive and permeable. It would be gone in no time. Argon is a good call. Acetylene or Propane... not so good

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Hmm. What about helium? You can buy it at walmart for filling party balloons.
(I like rule #1 the best![]()