Wait for another 5 minutes and then dip a red litmus paper in the mixture.

Our messages all come through on blue litmus paper.

The way we act when drunk is a litmus paper of general behaviour.

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

The litmus paper turned red when immersed in the liquid.

They are the litmus papers that enlighten the rest of us.

Is using litmus paper feasible, and if so, how do I perform the test?

He tore off a piece of litmus paper and dipped it into the water.

Reality is not a quality you can test with litmus paper.

It was the litmus paper of political and social climate in Poland.