noun
potash soap
A soft or liquid soap made from potassium hydroxide (potash), as opposed to hard sodium soaps. A technical term used in chemistry, manufacturing, and traditional crafts.
カリ石鹸は、カリウム塩を使った柔らかい石鹸です。
Potash soap is a soft soap made using potassium salts.
Standard modern spelling using the common kanji for soap.
Ateji spelling for カリ; rarely used.
Soda soap is made with sodium hydroxide and is typically hard, while potash soap is soft or liquid.
From カリ (potash, from Dutch 'kali' or German 'Kali') + 石鹸 (soap).