Carrageenan is a hydrophilic colloid, also known as eucheumarin, gelatin, carrageenan, and carrageenan, because carrageenan is extracted from red algae seaweeds such as eucheuma, gellidium, and carrageenan. It is a hydrophilic colloid whose chemical structure is the calcium, potassium, sodium and ammonium salts of polysaccharide sulfates composed of galactose and anhydrogalactose. Due to the different binding forms of sulfate esters, it can be divided into K type (Kappa), I type (Iota), and L type (Lambda). It is widely used in the manufacture of jelly, ice cream, pastries, soft candies, canned food, meat products, eight-treasure porridge, white fungus and bird's nest, soup foods, cold foods, etc.