Related Clues:

• Ill-natured
• Etching fluid
• Trip agent?
• One litmus test conclusion
• Caustic compound
• Hydrofluoric ___
• It's dropped for kicks
• Burn cause
• Hydrochloric or amino, e.g.
• Etcher's purchase, perhaps
• Part of DNA
• 91-Across, e.g.
• Etcher's purchase
• Low pH
• Sulfuric or hydrochloric follower