The difference between red-printed pork and blue-printed pork lies in different organizations and different meanings. The red stamp is a quality inspection stamp, which is stamped by the slaughter company, indicating that the pork has passed the inspection by the slaughter company and is qualified. The blue rectangular seal is an animal health and quarantine inspection stamp, which is stamped by the regulatory authorities, indicating that the pork has passed the inspection by the animal health and quarantine department and meets the food safety standards. Hongzhang pork comes from boars and is suitable for cooking such as stir-frying. Blue chapter pork comes from sows and is suitable for cooking methods such as stewing soup.