If the shrimp has black hair, but the shrimp body is not black, it can still be eaten. If the shrimp's head and body are black and smelly, you can't eat them. Most shrimps, because their heads contain an amino acid, will be converted into quinones under the action of biological enzymes in the body after being stored for a period of time, and will eventually become melanin, so that shrimp hair will turn black.

If the color of the shrimp head turns black, it is generally a normal phenomenon and can be eaten without adverse effects on the body. However, if it is stored for a long time or improperly, the shrimp head may turn black and be inedible at this time.

Preservation method of shrimp

The first method: put all fresh prawns in mineral water bottles, then fill them with water, tighten the lid and put them in the refrigerator for freezing. This method can greatly prolong the shelf life of prawns, and even after thawing 1 year, the taste is still fresh.

The second method: first put the prawns in the fresh-keeping box for half a day, then add fresh water frozen prawns in the fresh-keeping box, and then put them in the refrigerator for quick freezing, so that the preserved prawns can keep fresh taste for more than one year.

The third method: Boil prawns, control the moisture, and put them into fresh-keeping bags for quick freezing, which can keep the taste unchanged for about a month.