Material

Wood ash

Clay → Wood ash

Picture to come.

Description to come.

Made by

Charcoal burnfrom any charcoal wood (poles, ash poles); at charcoal clamp; by charcoal burner
Fire potteryfrom Clay, any fuel (poles, ash poles, firewood and 5 more); at kiln; by potter

Used to build

Cupellation hearthgives Cupellation hearth; from any stone (rough stone, limestone), Clay, Wood ash, Bellows; by smelter