what is agar made of
Agar-agar, usually seen abbreviated as agar, is a gelatinous substance derived from certain types of red algae, or seaweed. There are a number of uses for it, although most people are familiar with it as the culture medium in petri dishes.gar is derived from certain types of red algae. Agar and bacteria in a petri dish. Agar has a number of uses in the fields of microbiology and chemistry. Agar is used to make gelatinous foods like gummy bears.