litmus-paper

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. 2013.
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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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00:10
Litmus-paper is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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