Chemistry Paper to Test for Acid or Alkaline
This page is the CodyCross answer for the clue below from Paris, Group 258, Puzzle 4 (Foucault Pendulum).
Question is: Chemistry Paper to Test for Acid or Alkaline
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.