Normal black sesame seeds will fade slightly after soaking in water, but the color will not be too dark. There is a process for the natural pigment in black sesame to dissolve in water, so raw black sesame will not fade quickly in cold water at room temperature, except for aged black sesame.

Put raw black sesame seeds in cold water. If the color fades quickly, it is probably dyed. In addition, because only the seed coat of black sesame is black and the endosperm is white, you can cut black sesame with a knife to see if it is white inside. You can also put black sesame seeds in your palm. If the palm turns black soon, it means that the black sesame seeds are probably dyed.

Extended data

Black sesame is rich in natural vitamin E, ranking first among plant foods. Vitamin E is a good antioxidant, and proper vitamin E supplementation can play a role in moisturizing and beautifying.

In addition, sesame is one of the four major oil crops. The oil content of black sesame is mostly unsaturated fatty acid, and linoleic acid accounts for about half. Linoleic acid is an ideal skin care agent, because when the human body lacks linoleic acid, it is easy to cause symptoms such as dry skin, enlarged scales, growth retardation, and cholesterol deposition in blood vessels. Therefore, linoleic acid is also called "creatine"

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