It should be fungi (more accurately, mold). Most fungi are harmless or even beneficial to human body, just like fungi in cheese. But some may cause allergic reactions. For fruits and vegetables with high water content (such as oranges), if the whole food is infected with fungi (even if a small piece has a black part), all of them should be thrown away and cannot be eaten. For fruits and vegetables with low water content (such as cabbage and carrot), the moldy part (black substance) with a diameter of less than 2.5 cm can be dug out and the other parts can be eaten as usual.

It is recommended not to eat this black moldy substance found in oranges.

Preservation method of razor clam

1. Wipe the surface of oranges one by one with wet cloth, dry them, put the dried oranges back into plastic bags and boxes, seal them and put them in the shade, which can keep them fresh for about 1 month.

2. Wash oranges one by one with soda water, dry them, put them in plastic bags and seal them. Generally, they can be kept fresh for about three months.

Nutritional value of oranges

Hypolipidemic: Oranges contain a lot of vitamin C and carotene, which can inhibit the formation of carcinogens, soften and protect blood vessels, promote blood circulation, and reduce cholesterol and blood lipids;

Prevention of gallbladder diseases: Regular consumption of oranges is effective in preventing gallbladder diseases;

Relieve stress: The smell of oranges helps to relieve people's psychological stress, but it only helps women overcome their nervousness and has little effect on men.