There are various natural and artificial flavors in soda and many of them are subject to oxidation. High pressure CO2 leaves little room for dissolved O2, so as CO2 pressure drops more O2 is able to dissolve into the soda. The natural and artificial flavors start to break down as they react with oxygen. This makes the soda taste different and since some of the flavoring was broken down the salt already in soda becomes more noticeable
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