Potato skin dyeing is based on the browning principle of potatoes, because potatoes contain tyrosine and tyrosinase, which will produce melanin under the action of oxygen, thus changing the color of hair, but this dyeing effect can not be maintained, and it will dissolve when it meets rain.
Although dyeing hair with potato skin can't be as black as chemical dyeing, the hair dyed with it is naturally black and completely harmless to the body. Therefore, it is a natural and safe hair dye.
In fact, white hair is closely related to our mood, stress and diet. Especially when the pressure is too great and the body lacks nutrition. Therefore, if you want to prevent the appearance of gray hair, you must control your emotions and pressures reasonably and replenish your body with nutrition in time.
You can eat protein, vitamin B and other ingredients at ordinary times, which can help the hair to promote the formation of melanin on the scalp and is conducive to the growth of black hair. For example: eggs and milk rich in protein, coarse grains rich in vitamin B, etc. These can all play a certain role in white hair.