1. Litmus paper can be used as an indicator of the presence of acid in a solution.

2. Litmus paper turns red in the presence of an acid.

3. In a drawer the litmus paper mused upon which way to turn.

4. The litmus paper turned red when immersed in the liquid.

5. The use of litmus paper furnishes another example of such a transformation.

6. Litmus paper turns red on contact with an acid.

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7. Test: turns blue litmus paper red.

8. They turn blue litmus paper red.

9. We test the liquid for acidity with a strip of litmus paper.

10. Ammonia gas NH 3 is colorless which can turn wet red litmus paper to blue.