Not the substance used in making gunpowder, but natron, a mineral alkali composed of several salts of soda. It effervesces with vinegar, Pr 25:28, and is still used in washing, Jer 2:22. Combined with oil, it makes a hard soap. It is found deposited in, or floating upon, certain lakes west of the Delta of Egypt.
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American Tract Society Bible Dictionary
A Dictionary of the Holy Bible, American Tract Society, c. 1859, edited by W. W. Rand.