2. Purple potato is also called black potato. Originated in Belgium, it has a black skin and black meat, and has the reputation of "black beauty". Purple potatoes are rich in anthocyanins. Can enhance human immunity, delay aging, enhance physical fitness and enhance vision.

3. Violet skin is purple-black. After being cut, the purple color is fleshy, and the color is distinct like a blooming purple flower, which radiates outward from the center. Violet potato was certified as a pollution-free agricultural product by the Ministry of Agriculture in 24, and was recognized as a "green food grade A" product by China Green Food Development Center in 26.