Related Clues:

• Colourless acid in ants and nettles
• Colourless acid in nettles and ants
• Acid contained in nettles
• Antacid?
• Type of acid made by some ants
• -- acid, fatty acid found in ants and nettles
• Class emptied inorganic type of acid
• Piece oddly missing written on class of ants
• Kind of acid — coming from ants