Anthocyanins rich in purple potato will turn red-purple when it is acidic and blue-green when it is alkaline, so you can add a little lemon juice or white vinegar to purple potato porridge, which will make porridge appear ideal purple.
In addition, in order to avoid acid-base reaction, it is suggested that purple potato porridge should not be cooked directly with tap water, but with neutral boiling water, so that the cooked purple potato porridge will generally be purple and will not appear in other colors.
2 when the cooked purple potato porridge changes color in vinegar.
Generally, purple potato porridge will start to turn blue after being cooked for about half an hour. At this time, you can drop a few drops of vinegar or lemon juice, and it won't be long before the purple potato porridge gradually turns purple. If you put vinegar too early, it will volatilize and the effect will not reach the best effect.
3 Purple potato porridge turns green. Can you drink? Yes
The green color of purple potato porridge is usually caused by contact with alkaline substances, such as tap water at home. Because purple potato contains high anthocyanins, this natural plant pigment will turn blue-green when it meets alkaline substances. This is a normal phenomenon, and you can continue to eat without affecting your health. However, if the purple potato itself turns green and goes bad, it is not recommended to continue eating.
4 who is purple potato porridge suitable for? Most people can eat it.
Purple sweet potato is rich in dietary fiber, starch, vitamins, anthocyanins, glycoproteins, carotene, selenium, iron, calcium, potassium and other trace elements. When used to cook porridge, it can play a role in beautifying, resisting oxidation, enhancing memory, protecting blood vessels and improving immunity. For most people, proper consumption is edible. If it is a special group with allergies, it is recommended to reduce the consumption of purple potato porridge.