Dried, compressed blocks of tea leaves have been used in Asia as a source of food, component of beverages, and form of currency for centuries. In Ancient China, tea was often mixed with binding agents—including flour, blood, and manure—to increase its durability, thus fortifying the tea brick against the physical demands of its use as currency. Siberian nomads preferred tea-brick currency over metal coins and continued to use the edible money until what period? Discuss
Source: The Free Dictionary