Quote Originally Posted by scheimfluger_77 View Post
Ah! That would explain it. Having just reviewed a periodic table Nitrogen is probably not a good choice for a "blanket," being as Nitrogen is lighter than Oxygen. It seems Argon is a common gas used where a non-oxygen environment is required. Couple that with a brown glass bottle and a lid that actually seals the opening and your oxidation problem should be minimal.

Steve
I think also common today are propane or butane, both are heavier then air, not sure whether either gas could separate or contaminate chemistry. Obviously you wouldn't want to smoke around them, but you shouldn't be smoking anyway, especially in the darkroom....