Tells the Difference Between Bases and Acids
This page is the CodyCross answer for the clue below from Apothecary, Group 1970, Puzzle 5 (Symptom Relief).
Question is: Tells the Difference Between Bases and Acids
and the answer is: LITMUS
Word Meaning:
LITMUS — (uncountable) A dyestuff extracted from certain lichens, that changes color when exposed to pH levels greater than or less than certain critical levels.
Definitions from Wiktionary.