Fecha de publicación: 02/12/1997 Fuente: WIPO "propolis" A propolis piece is comminuted into fine grains or further into colloid to produce a propolis food which is easy to eat. The comminution is achieved using one of a rolling ball mill, a vibrating mill, a tower mill, a medium agitating mill, a roller mill, a high-speed tumbling mill, a jet mill, a planetary mill and an attrition mill.