This cream is a sugar alcohol secreted by fruits and vegetables, and it is a natural substance synthesized by biology. The cream here is not the residue left by pesticides. This is harmless to the human body. Frost on grape skin has protective effect on grapes, because this natural synthetic substance is insoluble in water. It is like a film to protect grapes, which can reduce water evaporation and prevent bacterial infection.

This frost can't be removed from the peel by soaking or scrubbing. Some people say that it can be washed off with flour, but this only changes the structure of hoarfrost. Frost is an identification sign of whether grapes are fresh or not. The best way to wash fruit is to wash it repeatedly with tap water. First, we cut the grapes and put them in a bowl or basin. Be careful not to open the grapes, add a spoonful of salt and flour. Stir well with water and soak for about 10 minute. Rub the soaked grapes by hand, preferably in the same direction, which will be cleaner.

When you buy fruit, you must pay attention to this layer of frost. Some unscrupulous traders sprayed a layer of white frosty chemicals on the surface of grapes. Make them look fresh, so be sure to pay special attention when choosing grapes. Naturally secreted hoarfrost is evenly distributed, and the color of grapes can be seen, while artificially produced hoarfrost is unevenly distributed. The surface cream also contains yeast, so the homemade wine can be fermented without yeast.

The nutritional value of grapes is that they are rich in glucose and fructose. People can eat staple foods such as rice and then convert it into glucose, which is absorbed by the human body. Eating grapes can be directly absorbed by the human body and quickly converted into energy for human activities. Secondly, grapes also contain a variety of organic acids, which can enhance the digestion, absorption and excretion of food. It also contains protein, vitamins, calcium, phosphorus, iron and other indispensable mineral elements.