1, color and appearance: blood glutinous rice, black rice and purple rice are all black rice, but the colors are slightly different. Blood glutinous rice is dark red, black rice is black, and purple rice is purple. Redmi, on the other hand, is red, and the color is more vivid.

2. Nutritional value and taste: These four kinds of rice are rich in protein, B vitamins, calcium, iron and other nutrients, but the specific content and proportion may be different due to varieties, growth environment and other factors. In taste, blood glutinous rice and Redmi are sticky, while black rice and purple rice are hard.