Why do homemade pickles fizz?
In Coke, it is added by adding pressurized carbon dioxide. Except with the bacteria in your pickles, the CO2 can ‘t escape, so it goes into solution. It fizzes out when you release the pressure. A very common contaminant that causes fizziness or pressure in acidic foods (tomatoes and pickles ) is Clostridium botulinum. Dec 7, 2010