In article .com,
wrote
Among woodworkers who use fine varnishes is an aerosol type can
containing the inert gas argon which they use to displace the oxygen in
a container of varnish before sealing it.
One brand name is called "Bloxygen"
This might be usefull for folks storing te that they wished to arrest
further oxidation of.
Here is a link to the makers faq.

http://www.bloxygen.com/faq.html

It contains carbon dioxide - combined with moisture, that will form
carbonic acid. I've no idea whether it will spoil tea, but it's worth
considering.

This particular product claims to use "medical quality" ingredients, so
it shouldn't be a problem, but it's worth noting that other compressed
gases, intended for industrial use, may be contaminated with suspended
oil droplets from the compressor.

--
Richard Herring