Related Clues:

• Hydrochloric or amino, e.g.
• Etcher's purchase, perhaps
• Nitric and boric
• Part of DNA
• 91-Across, e.g.
• Etcher's purchase
• Bases' antitheses
• Hydrochloric and boric
• It's no free ride
• Low pH
• Sulfuric or hydrochloric follower
• Type of rain
• Some are fatty
• Corrosive chemical
• See 48 Across