How to distinguish frozen pork after freezing processing and water injection?

Now there are red spots, which will secrete reddish liquid when thawed. If the color of frozen meat is different in different parts, the color of the meat does not change after pressing with your fingers. After thawing, the meat is soft and inelastic, indicating that the quality is not good, or the meat has been thawed many times.

Water-injected meat is grayish white or light gray and light green, and there is water oozing from the meat surface. Fingers touch the meat surface, hands don't touch it. Pressing paper with paper will make the paper moist and not easy to burn. After the frozen pork was thawed, a lot of reddish blood flowed out. The skin of dead pork carcass is purple-red, the fat is gray-red, and the blood vessels have black clots. Because the time of death is different, the smell is different.