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/litmus-test-strips-on-top-of-plastic-cups-with-various-multicolored-liquids-studio-shot-sb10068106g-001-582dec215f9b58d5b180eea2.jpg "Litmus Paper and the Litmus Test")
Litmus Paper and the Litmus Test
I Now Have a Political Litmus Test
litmus - Liberal Dictionary
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3 Ways to Do a Litmus Test - wikiHow
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What is a litmus test for acid and base? - Quora
There are 2 indicators litmus paper or universal indicator
litmus test – The Socratica Method
