Nitrogen is an inert gas but maybe CO2 not so inert. It is the gas that most plants use in photosynthesis. Although tea is a made product, I heard somewhere before that there may still be living enzymes in it. That is why I am not sure if CO2 is a good packing gas. I still need find out why nitrogen is not used in packing tea as some brands in Japan did before. There must be some reason.
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