FULLER'S SOAP
(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.) ......
SOAP
(Jer. 2:22; Mal. 3:2; Heb. borith), properly a vegetable alkali, obtained from the ashes of certain plants, particularly the salsola kali (saltwort), which abounds on the shores of the Dead Sea and of the Mediterranean. It does not appear that the Hebrews were acquainted with what is now called "soap," which is a compound of alkaline carbonates with oleaginous matter. The word "purely" in Isa. 1:2......