Jellyfish is a large warm-water jellyfish along the coast. It is rich in protein, sugar, inorganic salts and vitamins and has a unique flavor, so many people like to eat it. Jellyfish includes two parts: jellyfish skin and jellyfish head. The upper part of jellyfish is umbrella-shaped, called jellyfish skin, and the lower part is mouth and wrist, commonly known as jellyfish head. To buy jellyfish skin, we must first observe the appearance color. High-quality jellyfish skin is white or yellow, shiny, without red, erythema and sediment. You should smell it and see if it smells fishy. The jellyfish processed with salt and alum according to the traditional technology has a unique smell and no fishy smell. Then spread out the jellyfish skin. The bigger it is, the thinner it is, the whiter it is. The meat is tough, not brittle or broken, and the more solid and complete the stalk is. You can finally taste it. Tear off some jellyfish skin, wash it with water and chew it in your mouth. If it tastes crisp and loud, it is very biting, and it is a beautiful product in jellyfish. If it tastes dull and has no toughness, it is inferior. If the jellyfish skin is purple-black, smelly and has viscous liquid, it is spoiled and harmful to health. Never buy it.