1 Look at the shape High quality jellyfish skin is naturally round, round and complete, no holes in the middle, the edge of the neat. 2 Look at the color The color of jellyfish skin will be different depending on the place of origin, respectively, white, milky white, yellow, yellowish, etc., but the surface should be moist and glossy, without obvious red spots. Flesh thickness is uniform, tough and elastic, and there is a ringing sound when you bite it. Inferior jellyfish skin shape is not complete, there is broken, small diameter, thin flesh and inside and outside the umbrella layer healing is not strong. The skin surface is wrinkled and aged. The color is dark and lusterless, and there are obvious red spots on the surface. Flesh crispy, easy to rupture, no toughness.