Gas diffusion through bottles is the ONLY reason to transfer stuff to glass. LDPE for example is completely unsuitable for storing developers, but HDPE and PETE are fine.
Nitrogen (N2) is quite unreactive, certainly as far as photo chemicals are concerned. Seriously, no one is going to do a better job of packaging chemicals than the factory, unless it's those Digibase lids that would fall off in transit.
If you're gas-filling at home, hydrocarbons (butane lighter refill) is the easiest option. Heavier gases are better though and I think Protectan is something like a CFC.
Protectan is Butane by now.
Nitrogen is an inert gas under almost any circumstances---butane and propane are not, but are suitable for storing chemicals. Nitrogen is lighter than oxygen, so it will not blanket your solution for any length of time, though you shouldn't put much faith in any gas doing so. We use nitrogen and argon for all of our air-free chemistry at work.
Nitrogen is relatively inert. It does combine with oxygen, NOx for dragsters etc.
Argon is not only completely inert, it was the cover gas of choice for liquid sodium breeder reactors, it is heavier than air.
Both should work well for oxygen exclusion in photo chemical preservation. Though, theoretically Aragon a bit better due to being completely inert, and heavier than air.
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Either way, a nice trick is to put in a couple atmospheres worth of the inert gas then let it down to near 1 atmosphere. That will reduce the partial-pressure of oxygen even further.
PET plastic is amazingly resistent to oxidation and it is as available as your nearest trash can. Almost all soda, juice, etc are packed in this clear, brittle plastic with a very secure cap. FILL TO THE VERY RIM with either concentrates or mixed developer. Room temperature is fine. Tiny, 50ml liquor bottles (metal cap) are fine for smaller amounts and there are even tiny glass marbles (in case the larger ones do not fit) that are available in Arts and Crafts stores. - David Lyga