| Answer | Crossword Clue |
|---|---|
| TEST | Litmus or acid follower |
| TEST | Word with litmus or acid |
| TEST | Acid or aptitude follower |
| ROCK | Acid or hard follower |
| TEST | Acid or screen follower |
| RED | Like litmus, in an acid solution |
| litmus | blue coloring matter obtained from certain lichens, esp. Roccella tinctoria. In alkaline solution litmus turns blue, in acid solution, red: widely used as a chemical indicator |
