For this reason, it has long been an article of trade, and compressed bricks of black tea even served as a form of de facto currency in Mongolia, Tibet and Siberia into the 19th century.
Atas alasan ini, teh hijau sudah lama diperdagangkan, dan balok teh hitam yang dipadatkan malah menjadi mata uang de facto di Mongolia, Tibet dan Siberia pada abad ke-19.