Fuller’s soap
Easton’s Bible Dictionary (1897)
(Heb. borith mekabbeshim, i.e., “alkali of those treading cloth”). Mention is made (Prov. 25:20; Jer. 2:22) of nitre and also (Mal. 3:2) of soap (Heb. borith) used by the fuller in his operations. Nitre is found in Syria, and vegetable alkali was obtained from the ashes of certain plants. (See SOAP.)
See also: soap
Public-domain reference works, shown as published. They are historical and may differ from current scholarship; Aide names the interpretive tradition where it matters in the Lens and classes.