硬こう石せっけん

noun

hard soap; soda soap

Soap made with sodium hydroxide, producing a solid bar; contrasted with ソーダ石鹸 (soda soap) in some contexts, though often used synonymously.

See also: ソーダ石けん

• 硬こう石せっけんは洗せん濯たく用ようとしてよく使つかわれる。

  Hard soap is often used for laundry.

• この硬こう石せっけんは肌はだに優やさしい成せい分ぶんで作つくられている。

  This hard soap is made with ingredients gentle to the skin.