Enter a clue or pattern or both:
The Clue
Kind of paper or test (6 letter answer)
The Answer
LITMUS
Tags
Notes
The answer LITMUS is so rare that it appears less than once every 2500 puzzles.
Related Clues
Kind of test
Blue coloring matter
It turns red in acid
Definition
LITMUS as a noun:
1. (litmus, litmus test) = a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator