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After soaking black rice in water, some purple-black water comes out. The surface is not white, but the inside is white. Is this normal?
Not normal. Black rice will turn black-gray and purple-black after soaking in water. If it turns white, it may be dyed.

Intimate reminder: the supermarket is called black rice and purple rice. The washed water is purple-black. I suggest you buy it in the supermarket, because some unscrupulous vendors will sell rice as black rice. Black rice is difficult to cook. It is recommended to soak for one day before cooking. The ratio of black rice to water is 1: 2.5. Cook with strong fire when cooking. It's best to open the lid and let the rice roll freely, otherwise purple-black water will overflow everywhere. After the water does not overflow, turn to low heat and simmer. It takes about 20 to 30 minutes, and the cooked black rice smells good. 1 rich in fiber, good for constipation. It can lose weight, and the calorie of 100G black rice is 333 calories. It can be sent to more than half a catty after adding water. If people only consume 333 calories a day, it is difficult to lose weight. And half a catty of rice won't make you hungry, just at the expense of taste.

Identification of fake and shoddy crystals:::: There are two kinds of common adulteration of black rice in the market at present. One is inferior or inferior black rice stored for a long time, which is sold as inferior after dyeing; The other is that ordinary rice is dyed and sold as black rice. Natural black rice will fade after washing, but it is not as bad as dyed black rice.

When consumers buy black rice, they can identify the senses from the following aspects: First, look at the color and appearance of black rice. Generally, black rice has luster, uniform particle size, less broken rice and cracked waist (with cracks on the particles), no moth-eaten and no impurities. Inferior inferior black rice has dim color, uneven particle size, poor plumpness, more broken rice, insects and caking. For dyed black rice, because the black of black rice is concentrated in the cortex, the endosperm is still white. Therefore, consumers can scrape off all the outer cortex of rice grains and observe whether the rice grains are white. If it's not white, it's probably artificially dyed with black rice. Second smell: smell the black rice. Take a small amount of black rice in your hand, exhale hot air at the black rice, and then smell it immediately. High-quality black rice has normal fragrance and no other peculiar smell. Those with slight odor or musty, sour, putrid and peculiar smell are inferior and inferior black rice. Three tastes: taste the taste of black rice. A small amount of black rice can be chewed in the crowd, or ground before tasting. High-quality black rice tastes delicious, slightly sweet and has no peculiar smell. No taste, slight odor, sour taste, bitter taste and other bad tastes are inferior and inferior black rice.