| Answer | Crossword Clue |
|---|---|
| ACIDS | They turn litmus red |
| ACIDS | They turn litmus paper red |
| EYES | They can turn red in a flash |
| ACID | It turns litmus red |
| ACID | This turns litmus red |
| ACID | It turns litmus paper red |
| ALKALI | It turns red litmus paper blue |
| ACID | What red indicates in litmus tests |
