Agar-Agar: Agar-agar is a gelatinous plant material that is also known as “Chinese Gelatin” or “Japanese Isinglass.” Agar-agar is made of polysaccharides obtained from red seaweed found in coastal Japan, South America, Portugal and Spain. It is used as a culture medium, as a thickening agent in food, and as a vegetarian substitute for gelatin. Agar is a gel at room temperature, melting at approximately 70°C (160°F), and is capable of absorbing 300-500 times its weight of water.