If you open the crab, there is a black film inside, which is close to the shell. This black film is edible.

Because this black film is actually the shell that the crab has not grown up, the crab will shed its shell when it grows to a certain extent, and the black film inside will become thicker and thicker as the crab grows up. After the hard shell outside the crab falls off, the black film will become a soft shell, and it will become a hard shell over time. So what this black film can eat is something high in protein and calcium.

Extended data

There are four parts of crabs that can't be eaten:

1. Crab gills: Two rows of soft things like eyebrows growing on the belly of crabs, commonly known as crab eyebrows, are the respiratory organs of crabs, which are used to filter water quality and are very dirty. Don't eat the crab white under your cheek.

2, crab intestines: there are crab droppings inside.

3, crab stomach: the triangle is hidden in the crab yellow, and there is crab excrement hidden in the crab yellow pile on the crab cover.

4, crab heart: also known as crab hexagonal plate. Hexagonal, hidden in the middle of the thickest crab belly with yellow paste, it is the coldest and must not be eaten. Open the crab shell and you can see a black film. The white crab heart is between the yellow paste and the black film.

People's Network-Don't eat four portions of crabs! Count the six taboos of eating crabs