litmus paper

noun
a strip of paper impregnated with litmus, used as a chemical indicator.

Origin:
1795–1805

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

litmus paper n.
An unsized white paper impregnated with litmus and used as a pH or acid-base indicator.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Litmus paper will turn color if there is acid in the water and it will stay the
  same if there is not.
Add the diluted sodium hydroxide slowly to the dilute acid until the endpoint
  is reached using litmus paper.
Litmus paper, another natural pH indicator, also turns red in acids and blue in
  bases.
The merest trace of acid will turn blue litmus paper pink.
Synonyms
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