Nitre. — The mineral alkali found in the natron lakes of Egypt that took their name from it. The Hebrew word nether is the origin of the Greek and English words. (Comp. Proverbs 25:20.)
Sope. — Not the compounds of alkali and oil or fat now known by the name, but the potash or alkali, obtained from the ashes of plants, which was used by itself as a powerful detergent. The thought is the same as that of Job 9:30, and, we may add, as that of Macbeth, Acts 2, sc. 2 : —
“Will all great Neptune’s ocean wash this blood
Clean from my hand? No; this my hand will rather
The multitudinous seas incarnadine,
Making the green one red.”
The guilt was too strongly “marked,” too “deep-dyed in grain” to be removed by any outward palliatives.