Agar powder is a class of alginate extracted from rockweed and other red algae, which has been used in China and Japan for more than three hundred years. Agar is non-nutritive and is generally biological, even microorganisms do not decompose agar (although agar is a sugar). Therefore, it is commonly used as a biological culture medium, or some drug carriers. In addition, the food industry is more widely used, as a thickener, coagulant, agar melts at about 90 degrees, 40 degrees or so condensed into a solid, often eaten jellies, cold powder are added, is not harmful. Can also be used as a suspending agent, emulsifier, stabilizer, preservative. Widely used in the manufacture of granular orange and a variety of beverages, jelly, ice cream, pastries, fudge, canned goods, meat products, porridge, bird's nest and other foods.