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Fired earth kneaded back into raw clay to make a body that stands up to fire. It builds the stove and the tatara, and firing turns it into firebrick.
Obtaining
Usage
Start by kneading
Terracotta and a clay block worked together on the bench give refractory clay. Terracotta itself comes out of a furnace loaded with clay blocks, so a clay bank is all you need — no new tool, no new place to go.
As an ingredient
Behavior
Unfired furnace body
The stove and the tatara are built from the clay as it is. A furnace whose walls wear away with use is raised from kneaded earth, not from fired brick; the kiln, which is heated hard over and over, wants the fired version instead.
Related guides
In the real world
The body for firebrick is mostly crushed, already-fired clay — grog — bound together with plastic raw clay. The fired aggregate is what keeps the piece from shrinking as it dries and fires.
Differences in game
Satoyama folds the crushing into the single act of combining fired earth with raw clay, and does not model how refractory one clay is against another.