Cauldron

A cauldron is a block that can hold water, along with potions, dyed water and lava. It is also a job site block used by leatherworkers in villages.

Obtaining
Cauldrons can be mined using any pickaxe. If mined without a pickaxe, it drops nothing. When a cauldron is destroyed, its contents are lost.

Crafting
A cauldron can be crafted from iron ingots.

Natural generation


A single empty cauldron is generated in each witch hut. In Bedrock Edition, the cauldrons generated are filled with either a random potion or splash potion.

A cauldron $2/3$ full of water is generated in each igloo basement.

Cauldrons can be found in a few rooms inside a woodland mansion.

Two filled cauldrons can be found inside savanna, taiga, snowy taiga, and snowy tundra village tannery houses.

A single filled cauldron can be found in plains village and desert village tannery houses.

Three filled cauldrons can be found in plains village tannery houses.

Water
A cauldron can be filled with water by a water bucket on the cauldron. Once completely filled, a cauldron can be used to fill a water bucket by an empty bucket on the cauldron; this empties the cauldron. Despite containing water, using a fish bucket on a cauldron does not fill it with water, but places water against it. This is intentionally coded to happen.

One level of water can be added to a cauldron by a water bottle on it. One level of water can be removed from a cauldron, filling a water bottle, by a glass bottle on it.

A cauldron slowly fills with water when rained upon, if starting empty or with some water. This happens randomly - it is (on average) 1/20th as likely to happen as snow accumulating during snowfall.

Water can be stored in a cauldron even in the Nether.

Water in a cauldron does not absorb explosion damage, make sounds/particles, absorb fall damage, does not damage an enderman or a blaze, and fish act strangely inside it.

Removing dye
A cauldron with water can wash the dye off of leather armor and shulker boxes, and can remove the top-most pattern layer of a banner, by pressing on the cauldron with the leather armor, shulker box, or banner in hand. Each wash reduces the water in the cauldron by one level. The water does not become dyed while removing dye from objects.

Applying dye
A cauldron can hold dyed water. Tapping the cauldron with a dye in hand colors the water, consuming the dye. Different dyes may be added to produce mixed colors. Tapping 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.

Attempting to add water or potion to dyed water empties the cauldron.

Potions
A cauldron can hold potions: normal potions, splash potions and lingering potions. Tapping the cauldron with a potion in hand fills the cauldron one level with the potion, and turns the potion in hand to a glass bottle. The cauldron can then be tapped with an empty glass bottle in hand to fill the bottle, turning it to a drinkable potion, splash potion, or lingering potion, reducing the potion in the cauldron by one level.

Tapping on a cauldron that has potion with a normal arrow in hand transforms the arrow into a tipped arrow with that potion effect, and reduce the potion in the cauldron by one level. Tipping multiple arrows at once can be more efficient, and it may use more than one level at once. 1 level of potion tips up to 16 arrows, 2 levels up to 32, and a full cauldron can tip a full stack of arrows, resulting in 21.33 tipped arrows per potion.

Mixing potions or mixing water with potions in a cauldron causes an explosion sound, and the cauldron is emptied.

Extinguishing fire
A cauldron with water extinguishes entities on fire that fall into it. This includes mobs, players, items (if they land in the cauldron before burning up), and flaming arrows. Flaming arrows stuck into the side are extinguished also. Each entity extinguished causes the water in the cauldron to decrease by one level.

Redstone component


A cauldron can act as a power source for a redstone comparator. With a cauldron behind it (either directly, or separated by an unpowered solid block), a comparator outputs a signal strength proportional to how full the cauldron is: 0 for empty, 1 for one-third full, 2 for two-thirds full, and 3 for completely full. However, if there is a block between the cauldron and comparator, the comparator does not immediately update.

Storing lava


Cauldrons can be used to store lava. When a cauldron is already filled, it empties the cauldron and makes an extinguishing sound. A cauldron filled with lava burns any entity inside of it, and emits light in the same manner as lava. If water flows onto a cauldron filled with lava, the cauldron still holds lava.

Change profession
If a village has a cauldron and there are no leatherworker villagers, any villager in the village who hasn't already chosen a job site block has a chance to change their profession to leatherworker.

Block data
In Bedrock Edition, cauldrons use the following data values:

Block entity
In Bedrock Edition, a cauldron has a block entity associated with it that holds additional data about the block.

Trivia

 * Arrows "stick" to the water in a cauldron.
 * Sneaking over a cauldron does not prevent a player from falling in.
 * The inside of a cauldron is 0.3125 ($2/3$) blocks tall.
 * A cauldron holding water is the only way to have water in the Nether without the use of commands.
 * The water within does not work like water in the physical terms; the player cannot float/swim in it, and no bubble/water particles are produced.
 * In Legacy and Bedrock editions, the player can still 'use' the cauldron without a bottle or water bucket. However, it has no effect on the cauldron or the player.