| Answer | Crossword Clue |
|---|---|
| ALKALIS | They make litmus blue |
| CONTACTLENSES | They may make your brown eyes blue |
| ALKALI | It turns litmus blue |
| BASE | It turns litmus blue |
| BASE | It turns litmus paper blue |
| ALKALI | It turns litmus paper blue |
| REAGENTS | Litmus paper and methylene blue |
| ALKALI | It turns red litmus paper blue |
