The scientific name of hoarfrost on the surface of grapes is also called "fruit powder". This is a sugar alcohol substance secreted by grapes themselves, which belongs to a natural substance of biosynthesis. These hoarfrost can help reduce the water evaporation of fruits and prevent them from shrinking rapidly after picking. At the same time, because hoarfrost is insoluble in water, it can avoid bacteria growing on the surface of fruits due to excessive humidity, which is completely harmless to human body.

In fact, natural frosting is a good thing and a self-protection mechanism for plants. The frost on the surface of vegetables is the representative of freshness and maturity. There is a kind of frost called wax deposited on the surface of vegetables, which can protect and moisturize the epidermis of plants. The fresher the vegetables, the more obvious the frost will be. Vegetables like wax gourd, the more obvious the frost, the higher the maturity. So don't rush to wash the frost off the surface of vegetables.

These hoarfrost can help reduce the water evaporation of fruits and prevent them from shrinking rapidly after picking. At the same time, because hoarfrost is insoluble in water, it can prevent fruits from breeding bacteria due to high surface humidity.

Although frost is harmless to the body, it can't avoid some businesses spraying "frost". The difference is that the natural hoarfrost is evenly distributed on the surface of the fruit, and it will not mask the color of the fruit skin. If you spray cream by hand, the appearance distribution will be uneven and there will be dark blue marks. Therefore, when eating fruit, you must rinse or soak it with water.