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.

Obtaining
A dried kelp block will be broken the quickest with an axe.

Fuel
Dried kelp blocks can be used as fuel in a furnace. It lasts 200 seconds, meaning that it is able to smelt 20 items. This is 2.5 times as long as the burning time for coal or charcoal, but it is 10 minutes less than 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.

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

Trading
Butcher villagers buy 18 dried kelp blocks for an emerald as their only fourth tier trade.