Get How To Prevent Potatoes From Turning Brown Background. Potatoes naturally contain an enzyme that, when exposed to oxygen, reacts and results in discolouration on the surface. I can't tell if you're refrigerating these or just leaving them out, so i'll start by strongly recommending you refrigerate your cut potatoes.
Once peeled and cut, the potatoes can turn brown or grayish in color, which may not impact the taste, but it still makes them less than appetizing.
I'm assuming you're asking how to keep the potatoes from turning brown once they've been cut, but haven't been cooked. This trick keeps it green for over a week in the refrigerator and now readingthe magical trick that prevents pesto from turning brown. I did a science experiment, and i found out that the best way you can prevent potatoes from browning the longest is to dip them in either citric acid or lemon juice. We actually proceeded to boil these potatoes and made delicious mashed potatoes on the fifth day after cutting.