This statement has no basis. Chinese medicine says that the appearance is supplemented by black food such as black sesame seeds and black beans, and has nothing to do with vinegar. Soaking black beans with vinegar has the functions of tonifying kidney, losing weight, improving eyesight, whitening hair, lowering blood pressure and reducing blood fat. Wash the vinegar with balsamic vinegar and black beans, dry it, put it in a pot, stir-fry the water in the dried bean with medium fire, stir-fry it with low fire until the black bean skin cracks, and then put it in a clean container.