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Hmm. Our laser can work perfectly well on welding-quality gas, although I know we buy up a grade or two from that - fewer impurities == higher grade (and cost). But I wonder... from a connoisseur's perspective, is a more pure helium *more* tasty, or less? It's the impurities that make alcohol tasty - or horrid, depends on the impurities.
"A vintage helium, aged in a burnt-oak sherry cask with notes of xenon and phenols..."
"Pure helium, freshly decanted from Novgorod Tokamak, five 9's!"
@Momentrabbit Is not so much taste, is how much of an ache you get, afterwards. Helium hangovers are nothing to laugh about.