The umbilical color of normal black beans is white, and the unstained black beans are white after peeling, while the treated black beans will change color inside. In addition, black beans can also be put into white vinegar. If white vinegar is red, it is really black beans, because the skin of black beans contains blue and white pigment, which will react with vinegar and turn red.

Real black beans will have white spots on them. If it is dyed black beans, the white spots will also be dyed black. In addition, you can also carefully observe the color of the skin of black beans. The inner skin of true black beans is white, and the inner skin of dyed beans will also be dyed black.

Extended data

The efficacy of black beans

1, enhancing immunity. Black beans are rich in plant protein, and protein is an essential substance for human body, which can form antibodies against diseases. Insufficient intake of protein will lead to insufficient antibody synthesis, resulting in decreased immunity and easy fatigue. Eating more black beans can enhance immunity.

2. Anti-oxidation

Black food contains anthocyanin, which has a strong antioxidant effect, can remove active oxygen from human body, and has the functions of blackening hair, caring skin, anti-aging, regulating human physiological functions, promoting gastrointestinal digestion, and enhancing hematopoietic function.

Step 3 lower cholesterol

Black beans are rich in black bean saponins and black bean pigments, which have antioxidant effect and can prevent skin aging. In addition, black beans contain flavonoids, which often have the effect of blackening hair and delaying aging.

People's Daily Online-Interpreting the "king of beans" for you-those things about black beans.

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