noun
acid clay; Japanese acid clay
A naturally occurring clay with acidic properties, used in industry as an adsorbent, catalyst, or decolorizing agent. The term often refers specifically to a type found in Japan.
酸性白土は油の精製に使われる。
Acid clay is used in oil refining.
この地域では良質の酸性
High-quality acid clay is produced in this region.