First, unsafe hidden dangers.

Some unscrupulous merchants who make blood vessels add some formaldehyde (formalin) to keep them fresh. Formaldehyde has been identified as a carcinogen and teratogenic substance by the World Health Organization. 35-40% aqueous formaldehyde solution is commonly known as "formalin". Please pay attention to the purchase. Don't buy unsafe and insecure food.

Two or four strokes to determine toxic blood exuberance

1, look

Normal pig blood is dark in color, generally deep red; The pig blood in question is lighter in color. Normal pig blood has foam; There is no foam in the pig blood with problems. Normal pig blood slices are rough and the pores are irregular; The pig blood slice in question is smooth.

Step 2 touch

Normal pig blood is hard, fragile to the touch and heavy to pick up; The pig blood in question is the opposite.

squeeze

Normal pig blood contains crude fiber, which is kneaded into strips, and less red pigment remains on the hands after kneading; The pig blood fiber in the problem is less, granular and sticky, and the whole finger turns red after pinching.

Step 4 taste

Normal pig blood tastes a little sticky, and pig blood that doesn't stick to teeth is problematic.