Since the 14th century, bronze mortars became popular than stone ones, especially for use in alchemy and early chemistry. Bronze mortars would become more elaborate than stone ones, and had the advantage to be harder, and were easily cast with handles, knobs for handling and spouts for easier pouring. However, the big disadvantage was that bronze would react with acids and other chemicals and corrode easily. Since the late 17th century, glazed porcelain mortars became very useful, since they wouldn't be damaged by chemicals and would be easy to clean.