Robeson's cooked meat medium is the most widely used fluid medium for the culture of anaerobes. It consists of fat-free minced cooked meat in broth. It permits the growth of even strict anaerobes and indicates their saccharolytic or proteolytic activities, by the meat being turned red or black, respectively. Ref: Textbook of Microbiology By Ananthanarayan, 6th edition, Page 41.