Also know as (lat.) gelidium armansii, gelidium cartilagineum, gelosio, E406, agar-agar is the extract of some seaweeds of the gelidacee family, dried and processed.

Agar-agar is a yellowish powder, nearly adourless.

Insoluble in cold water and ethanol, soluble in hot water. Presents incompatibility with alcohol and tannic acid.