Cauldrons are a form of brewing equipment that appeared in 1.9 Beta. The brewing function was later replaced with the brewing stand because of the inconvenient method of brewing with the cauldron. It would have been used to make potions using brewing recipes. Cauldrons can be found in Witch Huts, Woodland Mansions, the basements of Igloos, and tannery houses in Villages.
As of Beta 1.9 pre-release 3, cauldrons can now be crafted, and used to store water. Cauldrons can now refill glass bottles with the water required for brewing. Each cauldron can hold up to three bottles worth of water (in console edition and Bedrock Edition player can also store potions in cauldrons), which is equal to a single bucket. Despite being able to fill up any empty bottles with any regular source block, cauldrons have a new feature that allows them to emit a redstone signal when a redstone comparator is placed beside it. The more water that's inside it, the stronger the signal. It is also used for returning leather armor to their original color if it is dyed, and dyeing the leather armor if it's not already dyed. Also note, they are useful in the Nether, as cauldrons are the only items one can put water in. If a village has a cauldron but no leatherworker, any nearby Villager without a profession has a chance to become a leatherworker.
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- Cauldrons cannot hold milk and lava (Though in the Bedrock Edition, it can), despite these being able to be carried in buckets.
- Potions can be brewed in 1.9 Beta pre-release 2 by adding a bucket of water along with various other ingredients to a cauldron which then runs them through a mathematical algorithm that can result in one of over two thousand different potions with positive or negative effects.
- When broken, cauldrons do not drop water, but only the cauldron itself.
- When the cauldron is being mined with water in it, the mining animation will superimpose itself over the water as well.
- If a cauldron is outside, when it rains, the cauldron has the potential to fill with water.
- A cauldron generates in a witch hut and it may have any kind of potion inside it.
- Using a cauldron is inefficient, since one water block source in a cauldron can only fill three bottles, while a water source placed anywhere can fill infinite bottles.
- As of 1.8 one can use cauldrons to remove the dye on a banner, just like leather armor.
- In Minecraft: Bedrock Edition, cauldrons can be used to hold brewed potions (i.e. Potion of Weakness), and can be used to create tipped arrows with the potion effect, or even fill bottles when the player needs them. But if a player fills a cauldron that contains a brewed potion with a different one (ex. Putting a Potion of Strength in a cauldron containing a Potion of Healing), then the potion inside the cauldron would vanish.
- Players can now place lava on a cauldron in the Bedrock Edition, and will get burned when they go on the lava-filled cauldron. For some reason, villagers will not classify this as a job block.
- In Minecraft: Bedrock Edition, it can hold dyed water to dye leather armor and horse armor. This is more effective way than in crafting grid.