When investigating the pH (acidic, neutral, alkaline) of a liquid, don't soak the litmus paper completely in the liquid but just put the end of the paper in it.
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Since primary school we've been checking for the qualities known as acidity and alkalinity with litmus paper.
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He dipped into this bottle or that, drawing out a few drops of each with his glass pipette, and finally brought a test-tube containing a solution over to the table. In his right hand he held a slip of litmus-paper.
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These elections will be a litmus test for the government.
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English example sentences with "litmus"