Related Clues:

• DNA's A
• Something you might trip on
• Amino or boric
• Biting, as wit
• Alternative to mushrooms?
• LSD, slangily
• What red indicates in litmus tests
• It's been taken for many trips
• Low-pH stuff
• Alkali balancer
• Lemon juice, e.g.
• It is neutralized by alkali
• __ rock
• It turns litmus red
• Caustic and biting