1. method 1: washing with water
high-quality black rice: after washing with water, the soaked rice water is purple. After dilution, it is purplish red or close to lavender. Cold water immersion has almost no color, while warm water and hot water immersion have obvious changes.
fake black rice: the water soaked in dyed inferior black rice looks like ink, and it is still black after dilution. This color can also be dyed on containers and hands, and it is still black even after several rinses. Discoloration after soaking in cold water.
2. Method 2: Look at the color
High-quality black rice: The authentic black rice is naturally grown and shiny black, and the black rice in bundles looks more consistent in color.
fake black rice: dyed black rice looks dark black, and it will not be shiny in light, and the color may be different shades.
3. Method 3: Look at the appearance
Look carefully to see if there is a small white spot at the tail of the black rice. The tail of the real black rice will have a small white spot, and the fake black rice after dyeing will be dyed. And there will be rice grooves on the surface of really black rice.
4. Method 4: Scraping black rice
High-quality black rice: Scrape the epidermis of black rice or cut the black rice in half, and the rice core is white. Scrape the rice skin with your fingers, and the skin has flaky rice skin.
Fake black rice: Generally, rice is transparent, and the dyed black rice, the color of dye will seep into the rice core, and the rice core is also black; Bad black rice skin is either not available or powdery.
5. Method 5: Smell and taste
The high-quality black rice smells pure fragrance carefully. After chemical treatment, the dyed black rice will have irritating taste, and it will be chewed in the mouth. The real black rice has sweetness, while the dyed black rice has peculiar smell.
6. Method 6: White vinegar identification
High-quality true black rice contains anthocyanins, which will change color when it is mixed with acidic solution. When white vinegar is lowered to black rice, black rice will be purple-red, while fake black rice will have no color change because it does not contain anthocyanins.
7. Method 7: Identification of Alkaline Surface Water
Anthocyanins in black rice will also change color when it meets alkaline solution. When black rice is put in alkaline surface water for a long time, real black rice will turn blue-purple, while fake black rice will basically have no color change.
8. Nutritional value of black rice
1. Black rice is rich in nutrients such as protein, fat, carbohydrates, B vitamins, vitamin E, calcium, phosphorus, potassium, magnesium, iron and zinc;
2. Black rice has many physiological functions, such as scavenging free radicals, improving iron deficiency anemia, anti-stress reaction and immune regulation.
3. Brass compounds in black rice can maintain the normal osmotic pressure of blood vessels, reduce the fragility of blood vessels, prevent the rupture of blood vessels and stop bleeding;
4. Black rice has antibacterial, blood pressure lowering and cancer cell growth inhibiting effects;
5. Black rice can also improve myocardial nutrition and reduce myocardial oxygen consumption.