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When a dry sponge comes into contact with water, it will instantly absorb water blocks in all directions within a 7 block radius of the sponge. As soon as a dry sponge absorbs any amount of water, it is immediately converted into a wet sponge block.
Heating a wet sponge in a furnace or Blast Furnace will revert itself into its original dry state. Placing an empty bucket in the fuel slot of the furnace while smelting a wet sponge, will fill the bucket with the "evaporated" water (yielding one water bucket for each wet sponge). Wet sponges will also automatically dry themselves when placed in the Nether.
- Can be harvested from the ceiling of a specific room inside an ocean monument. The room contains approximately 30 sponges, and the sponges do not require a tool to gather.
- Dropped by elder guardians when killed (the dropped sponge can be either wet or dry).
- Both wet and dry sponges have the same breaking and placing sound effect as grass.