Hairy tripe is also called tripe tripe, commonly known as tripe tripe, which is actually the flap stomach of cattle. Cattle is a ruminant, different from other domestic animals, the biggest feature is that it has four stomachs, namely rumen, reticulate stomach (honeycomb stomach), flap stomach (louver stomach, commonly known as bovine louver) and abomasum. The first three stomachs have no gastric glands and do not secrete gastric juice, which are collectively called forestomachs. The fourth stomach has gastric glands, which can secrete digestive juice, similar to the stomachs of pigs and people, so it is also called true stomach. There are also two kinds of beef venetian blinds, which are black when they grow up eating feed and yellow when they grow up eating grain crops. Beef tripe is not a plant, but a fresh tripe with a black surface. The white cowhide is bleached, which is frozen food.

Pay attention to when buying hairy belly, especially white hairy belly will turn white after being soaked in hydrogen peroxide and formaldehyde for three or four days. When making water-borne products, some unscrupulous traders first soak them in industrial caustic soda to increase their volume and weight, and then add formaldehyde and hydrogen peroxide in proportion to stabilize their volume and weight and keep their surfaces fresh and bright. The hairy belly brewed with industrial caustic soda is full and very watery. The use of formaldehyde can make the hairy belly more crisp and taste good. Hydrogen peroxide can corrode human gastrointestinal tract and lead to gastric ulcer. Long-term consumption of hairy tripe soaked in these toxic substances will lead to diseases such as gastric ulcer, which can cause cancer in severe cases.

If the hairy belly is very white, more than it should be, and the volume is large, you should avoid buying it. The hairy belly soaked with formaldehyde will lose its original characteristics. It is easy to break when the hand is pinched, and it will shrink rapidly after heating, so it should be avoided.

You can also add a little hairy belly to a small glass, soak it in water, then take out the hairy belly, tilt the glass, and carefully add a little concentrated sulfuric acid along the glass wall to divide the liquid into two layers, so as not to mix. If a purple ring appears at the junction of the liquid surface, it proves that formaldehyde is mixed in the hairy belly.

It is for this reason that the black one is more expensive than the white one!