Agar powder is a phycolloid extracted from a group of red marine algae , it solube in hot water but insoluble in cold water . as a solidifying agent , supension agent and desissant , it can be used in preparing microbiological culture media , bio - engineering , and food manufacture 性状:本品有海洋中生长的红藻为原料精制而成的水胶体,易溶于沸水,不溶于冷水,作为凝固剂、增稠剂、乳化剂、悬浮剂和干燥剂可应用于微生物培养基、生物工程、食品加工等。