1. color: the real dry pork trotters are dark brown or dark gray, and the surface has a certain gloss. If the color is too bright or the surface is dull, it may be a fake.
2. Smell: The real dry pork trotters have a faint fishy smell. If there is a chemical smell or other peculiar smell, it may be a fake.
3. Texture: The real dry pork trotters are hard and elastic. If it feels soft or too hard, it may be a fake.
It is best to buy pig's trotters sold by reputable merchants, and pay attention to check the product label and production date. If in doubt, you can consult professionals or relevant institutions.