Brick tea, also called autoclaved tea, as its name implies, is a kind of tea that looks like a brick. Brick tea is a kind of black tea, which is autoclaved at high temperature and high pressure. The main raw material is black tea. All brick teas are autoclaved, which can be divided into green brick tea, black brick tea, Fuzhuan brick tea, Kangzhuan tea and so on according to the different raw materials and production techniques. So brick tea is neither black tea nor green tea.