my country’s newspapers still use ink printing. A big problem with ink contamination is the pigment. These pigment particles are very small and have strong adsorption capacity. They contain heavy metal elements such as lead, chromium, cadmium, and mercury, all of which have certain toxicity. In addition, ink contains a toxic substance called polychlorinated biphenyls, whose chemical structure is similar to pesticides. If you wrap food in newspaper, it will seep onto the food and then enter the body with the food. When the storage amount of PCBs in the human body reaches 0.5-2 grams, poisoning will occur. In mild cases, the symptoms include red and swollen eyelids, sweaty palms, and red pimples all over the body; in severe cases, nausea and vomiting, abnormal liver function, muscle aches, incessant coughing, and even death. These toxins can cause cancer in human cells and even damage the genetic genes of cells.