Related Clues:

• Vitamin C, for one
• Like gastric juice
• Cause of many trips, once
• Cause of much bellyaching?
• Vitriol
• 60's trip cause
• Rain contaminator
• Dropped drug
• It may cause a bad trip
• Low-pH
• Etching aid
• Start of a trip
• Litmus-paper reactant
• Vicious
• Subject of some of 32-Down's writings