Soft soap

Japanese: soft soap(英語表記)softsoap
Soft soap

…A special soap made from potassium salts of higher fatty acids. It is also called soft soap because it is soft and has a paste-like consistency. Soap is made by saponifying fats and oils with an alkali to produce glycerin and fatty acid alkali salts (soap). However, regular soaps use sodium hydroxide as the alkali, and after the saponification reaction, the soap and glycerin are separated by salting out. …

*Some of the terminology that mentions "soft soap" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…高級脂肪酸カリウム塩からなる特殊なセッケンの一つ。軟質でのり状を呈するので軟セッケンsoft soapともいう。セッケンは油脂をアルカリでケン化し,グリセリンと脂肪酸アルカリ塩(セッケン)としてつくられるが,一般のセッケンはアルカリとして水酸化ナトリウムを使用し,ケン化反応後,塩析してセッケンとグリセリンを分離する。…

※「soft soap」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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