Minecraft wiki entry for Cauldron, associated text: A cauldron with water or powder snow extinguishes entities on fire that fall into it and the entity emits black particles. This includes mobs, players, items (if they land in the cauldron before burning up), and flaming arrows‌[JE only]. Flaming arrows stuck into the side are also extinguished. Entities must reach the water or powder snow in it. Each entity extinguished causes the water or powder snow in the cauldron to decrease by one level.