Minecraft wiki entry for Cauldron, associated text: In Bedrock Edition, leather armor is dyed through a cauldron, so a cauldron can hold dyed water. Using a dye on a cauldron filled with water colors the water, consuming the dye. Different dyes may be added to produce mixed colors. Using leather armor or leather horse armor on the cauldron dyes that item the color of the water, reducing the water in the cauldron by one level for each item dyed.