² tn The second simile mentions pouring vinegar on soda. The LXX has “scab,” but that does not fit as a sensitive thing. The reference is to sodium carbonate (natural in Egypt) which can be neutralized with vinegar.

² tn The word בֹּר (bor, “lye, potash”) does not refer to purity (Syriac, KJV, ASV), but refers to the ingredient used to make the hands pure or clean. It has the same meaning as בֹּרִית (borit), the alkali or soda made from the ashes of certain plants.