There are two common cases of black rice adulteration on the market: one is old rice or low-quality black rice that has been stored for a long time and is sold as inferior after being dyed; the other is ordinary rice. Rice is dyed and sold as black rice. As consumers, how should we identify black rice? The following is the method I compiled for you to identify the authenticity of black rice. I hope it can help you.

How to identify the authenticity of black rice

Method 1: Dropping white vinegar method

Operation method:

1. Take some black rice and put it in Put it into a plate or bowl;

2. Add some white vinegar;

3. At this time, the color of the white vinegar will turn red.

Principle of discoloration: Black rice is rich in anthocyanins, which will turn red when exposed to acidic vinegar

Test results prove:

1. This Black rice is not dyed rice;

2. But it cannot be ruled out that it is mixed with some dyed rice or some rice with anthocyanins extracted.

The final improved test method: randomly select a few grains of black rice, and drop white vinegar on them one by one. If they all turn red, it means that the black rice is all real. If the black rice only turns slightly red, it means The anthocyanins of this black rice have been extracted. If there is no reaction at all or it changes to another color, it can basically be determined that it is dyed black rice.

Method 2: Edible alkali test method

Operation method:

1. Put an appropriate amount of black rice in a plate or bowl;

2. Add an appropriate amount of water;

3. Add a small spoonful of edible alkali and stir;

4. At this time, the color of the water will turn blue;

Principle of discoloration: The anthocyanins in black rice will turn blue when encountering alkaline substances;

The test results prove:

1. This black rice is not dyed rice; < /p>

2. However, it does not rule out that some dyed rice or some black rice has anthocyanins extracted from it;

The improvement method is the same as above. However, since not every household has edible alkali, the popularity of this method is not high. Therefore, the white vinegar test method still proves to be the most accurate and practical.

The grains of rice cooked with non-waxy black rice will be more distinct than those cooked with glutinous black rice. Since black rice is really difficult to cook, you must remember to soak it 12 hours in advance and put it in the refrigerator. It will be better to cook it the next day. Is it normal for black rice to lose color?

The main reason why black rice loses color is because the surface layer of natural black rice contains water-soluble pigments anthocyanins. This is the main reason why black rice turns black. Anthocyanins are in the water-soluble It will dissolve in the environment. The higher the temperature, the more unstable it becomes. Therefore, the color of black rice will fade during the cooking process. This is a normal phenomenon.

However, generally speaking, black rice does not change color seriously after being soaked in cold water for a period of time. It will only slowly fade when soaked in high-temperature water or during the cooking process. The color is: Purple or nearly red. How to choose high-quality black rice

First look: Look at the appearance and glossiness of black rice. Poor-quality or dyed black rice has no luster on the outside and is a dull black color with uneven size and a lot of broken rice. It is easy to clump; while real black rice has a shiny appearance and evenly sized grains. If you scrape off the outer cortex of black rice, the endosperm inside will be white. This is because during the dyeing process of dyed black rice, the pigment will penetrate into the rice core, causing the endosperm to be dyed black. It is recommended that when purchasing, you can take a grain of black rice and bite it open to see if there is white stubble. That's real black rice.

Second smell: Real black rice has a light fragrance and no peculiar smell. When buying, you can grab a handful of black rice and put it in the palm of your hand, just like buying tea, exhale into the palm. Then immediately get closer and smell the smell. If there is a slight odor or abnormal smell such as mildew, sourness, etc., it is likely to be inferior or dyed black rice.

Three tastes: When purchasing, take a small amount of black rice and put it into your mouth to chew. High-quality black rice is slightly sweet and has no peculiar smell. Abnormal tastes such as no taste, slight peculiar smell, sourness, bitterness, etc. are all Inferior goods dyed black rice.