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by gtvwill 3559 days ago
The purity in gasses mostly refers to the presence of water vapour or machine oils. A great example of machine oil presence is in cheap nitrous canisters. Easy to see, just go find someone hitting the hippie crack at a party, wait till they finish a hit and ask to have a geez at their Bulbinator. Unscrew that bad boy and wipe your finger around the inside of the canister. Will 9 out of 10 times come out with oil residue on it. Nasty shit.