Related Clues:

• See 43 Across
• Soapmaking ingredient
• Caustic alkali
• Caustic matter
• Part of RNA
• Alkali in cleansers
• Sulphuric or nitric
• Boric, e.g.
• Low-pH substance
• Sour-tasting substance
• Carbolic and sulphuric ender
• Base neutralizer
• KOH, to a layperson
• Scathing
• Target of milk of magnesia