Cauldron

A Cauldron is a block that can hold water.

Obtaining
Cauldrons can be obtained by crafting, and can be found in witch huts.

Crafting
A cauldron can be crafted from iron ingots.

Natural generation
A single empty cauldron is generated in each witch hut.

Usage
To fill a cauldron with water, right-click on the cauldron with a water bucket. A cauldron also has a chance to fill up with water when rained upon.

With water in it, a cauldron can be used to fill glass bottles (turning them into water bottles) or to wash dye off of leather armor. To use the cauldron, right-click on the cauldron with the glass bottle or leather armor. A cauldron will extinguish mobs on fire (including players) who fall into it. Each use (including extinguishing mobs) causes the water level in the cauldron to decrease by one-third. After it has been used three times, it will be empty and must be refilled before additional uses.

Zombies and skeletons in a filled cauldron won't start burning from being exposed to sunlight, but each time they don't start burning lowers the water level in the cauldron and it will quickly empty and stop providing any protection. Endermen in a filled cauldron don't take damage from the water in it.

A cauldron cannot be used to fill an empty bucket, and water bottles cannot be used to refill a cauldron. A cauldron can be filled from a water bucket in The Nether.

A cauldron can act as a power source for a redstone comparator. With a cauldron behind it (possibly separated by an unpowered solid block), a comparator will output 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.

When a cauldron is destroyed (dropping itself as an item), any water inside it will be lost.

A cauldron can be used to wash off the top pattern layer from a banner.

Trivia

 * Arrows "stick" to the water in a cauldron.
 * If you try to sneak over a cauldron, you can still fall in.
 * Inside a cauldron is 0.313 blocks tall.
 * While a cauldron that contains water is being broken, the water will show cracks as if it were a block.