Dried Kelp Block

"I built myself a house out of kelp blocks! Some people warned me a house built entirely out of underwater plantlife might have a nasty aroma. But as a man who reeks of rotten fish anyway, I didn't mind in the slightest!"

- Tom Stone

Dried kelp blocks are blocks that are primarily used as a fuel in furnaces.

From block loot
Dried kelp blocks can be mined using any tool or by hand, but a hoe is the fastest way to break it.

Info
Unlike hay bales, dried kelp blocks cannot be placed directionally, despite being bundled dried plant matter and using the same type of model.

Breaking
Dried kelp blocks can be mined using any tool or by hand, but a hoe is the fastest way to break it.

Fuel
Dried kelp blocks can be used as fuel in a furnace. It lasts 200 seconds (i.e. 3.333333 minutes), meaning that it is able to smelt 20 items. This is 2.5 times as long as the burn time for coal or charcoal, but it is one-quarter (¼) the burn time of a block of coal, which can smelt 80 items. It is the fuel with the highest smelt time below 64 items, and just like blaze rods, the highest amount that can be smelted without any refills or hoppers and without loss of fuel is 60 items. This makes the dried kelp block very useful for unsupervised non-automated smelting.

However, crafting it requires first smelting 9 pieces of kelp, so its net fuel value is only 11 items,. Even so, if, e.g., a lava bucket is used to smelt 100 pieces of kelp, these could be used to make 11 dried kelp blocks, which in turn can smelt 220 items, slightly more than doubling the lava's original fuel value.

Composting
Dried kelp blocks have a 50% chance of increasing the compost level in a composter by 1.

Trading
Expert-level butcher villagers buy 18 dried kelp blocks for an emerald as their seventh trade.

Expert-level butcher villagers buy 10 dried kelp blocks for an emerald.

Storage
Dried kelp blocks can be used to store dried kelp in an efficient and compact way.

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