Half a croissant, on a plate, with a sign in front of it saying '50c'
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multiatomosphere gas-pak keep things fresh

A package of food, which would previously been filled with nitrogen to reduce oxidation, now has a bag full of 5 atmosphere argon gas. After the initial opening, the 5 atmosphere gas keeps seeping out, causing the container to have argon, rather than oxygen, keeping the material fresh even after opening.
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A package of food, which would previously been filled with nitrogen to reduce oxidation, now has a little bag full of 5 atmosphere argon gas. After the initial opening, the 5 atmosphere gas keeps seeping out, causing the container to have argon, rather than oxygen, keeping the material fresh even after opening.

It is possible this works a little better if the package has a 1.1 ATM pressure vent, so that the slightly pressurized mixed atmosphere is replaced with argon

beanangel, Nov 12 2016

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       A package of food, which would previously been filled with nitrogen to reduce oxidation, now has a little bag full of 5 atmosphere argon gas. After the initial opening, the 5 atmosphere gas keeps seeping out, causing the container to have argon, rather than oxygen, keeping the material fresh even after opening.
MaxwellBuchanan, Nov 12 2016
  

       // krypton //   

       "Krypton's concentration in the atmosphere is about 1 ppm. It can be extracted from liquid air by fractional distillation."   

       So for every ton of LOX, LN and Argon, you get 1g of krypton.   

       That makes it kind of expensive ... possibly to the point where the packaging costs substantially more than the food.
8th of 7, Nov 12 2016
  

       //for every ton of LOX, LN and Argon, you get 1 kg of krypton//   

       If it's at 1ppm, wouldn't that be 1 gram of krypton?
MaxwellBuchanan, Nov 12 2016
  

       Just curious, what foods need to be kept away from oxygen after package opening ? Is it those low flash-point cookies I can't finish in one sitting ?   

       Many things need to be kept away from sunlight and moisture e.g. crisps and potatoes.   

       What about xenon ? Everyone loves 4th day disco sliced bread.   

       [Actual real life anecdote - "This lemon chicken soup is disgusting!" ... "Its not lemon chicken soup, its just regular chicken soup" ... "So why does it taste all lemony ?"   

       A little googling later and cheap sliced bread can be preserved with high amounts of citric acid, which is apparently not noticeable until you dunk into chicken soup.]
bigsleep, Nov 13 2016
  

       If you'd simply crack open a dewar of liquid N2 in your fridge, you'd bathe your perishables in an inert gas AND keep them cool at the same time.
Cuit_au_Four, Nov 13 2016
  

       // wouldn't that be 1 gram of krypton? //   

       We are glad that at least one person in the class is awake ...
8th of 7, Nov 13 2016
  

       An oxygen absorber is cheaper, more effective, and comes in a convenient tiny pouch format.
WcW, Nov 15 2016
  

       5 atmospheres of nitrogen is not going to "seep" out of an opening in a container, especially any opening big enough to extract something from the container. The gas is going to rush out. And I don't see anything in this Idea to keep the argon from rushing out, either, even before the opening is closed for the first time, after the initial opening.
Vernon, Nov 15 2016
  

       [beanagel] comes in a convenient tiny pouch format ?   

       Well, well. Who knew, eh ? He certainly sucks all the oxygen out of a room ...
8th of 7, Nov 15 2016
  

       [vernon] The Guinness bubblator is sort of a gas reservoir at the base of a container of Guinness. It gradually releases carbon dioxide from the base to provide on-tap like amounts of froth from being a carbon dioxide reservoir - and you just reminded me of it!   

       ...so I still think it could work.
beanangel, Nov 15 2016
  
      
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