H1253
בֹּר
lye
lye, potash, alkali used in smelting metal
Full Brown-Driver-Briggs lexicon entry
I. בֹּר noun masculine lye, potash, alkali used in smelting metals Isa 1:25
**read probably כַּכֻּר as in a furnace (Isa 48:10); there seems no evidence that 'lye' (i.e. water mixed with the burnt ashes of plants containing potash, used formerly for washing) was ever used in refining gold or silver: compare J. NapierAnc. Workers in Metal {1856}, 15, 20, 25 WAM in SmithDB ii. 368; Amer. Rev. Ed. (1871, vol, iii), 1939. (see בֹּרִית).
2 occurrences
Job (1), Isaiah (1)