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Firstly, Bananas go brown because of chemical reactions not bacteria. Read more here
https://www.britannica.com/story/why-do-bananas-turn-brown
Bacteria is not finding a target. Something/Someone should introduce it to the target. For instance we make curd where I come from and to do that we have to add a few drops of lactobacillus(either old curd drop or red chilly with stem intact) to the warm milk to create Curd.
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