Rub with your hands: rub rice with your hands to see if there is dye on your hands. If there is black dye, it is fake rice.
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Nose smell: Authentic black rice has natural rice smell after soaking in warm water, while dyed rice has peculiar smell.
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Look at the color: authentic black rice skin is shiny, deep and light in color, while dyed black rice is dull and consistent in color.
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Look at the epidermis: the epidermis of authentic black rice is flaky and has nails. If it is powdery, it is inferior black rice.
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Look at the rice heart: the rice heart of authentic black rice is white. The rice heart of ordinary rice is transparent and colorless. If dyed black rice is dyed with ordinary rice, the color of the dye will penetrate into the rice heart and become black.
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Look at the rice soaking water: the rice soaking water of authentic black rice is purplish red, and it is also purplish red or reddish after dilution. If the soaked water is still black after being diluted like ink, it must be fake rice.
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Add white vinegar: black rice water will turn green in case of alkali and red in case of acid. Authentic black rice water will turn red immediately when it meets acid. Put some black rice into the cup at random, pour white vinegar into the cup, and stir well. After a while, the white vinegar turns red into real black rice and black into fake black rice. A small amount of red and black rice is caused by extracting anthocyanins and then dyeing them black.
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Black rice is a kind of rice used for both medicine and food, belonging to glutinous rice. Black rice is a characteristic variety formed by long-term cultivation of Gramineae rice. There are two kinds of grain types: indica rice and japonica rice, and the grain quality is divided into waxy and non-waxy. Brown rice is black or dark brown.
Black rice is dark in color and rich in nutrition, and has the reputation of "black pearl" and "king of rice in the world". It is produced in many places in China, such as Shaanxi black rice, Guizhou black glutinous rice and Hunan black rice. High edible value, besides cooking porridge, it can also be used to make various nutritious foods and make wine.