The fruits of black miscellaneous grains such as black-hearted black beans have natural pigments, which are usually deposited in the protective film of the epidermis. When fried, the pigment decomposes and turns yellow. Green nuclear black beans refer to black beans, also known as black beans and black beans, which are flat in nature and sweet in taste and belong to kidney and spleen meridians. Efficacy: promoting blood circulation and promoting diuresis, expelling wind and detoxicating, invigorating spleen and tonifying kidney.