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Roaring
ANSWERS: 2
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www.collinsdictionary.com/us/dictionary/english/litmus-test
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To the best of my knowledge, it is one of the oldest forms of pH indicator, used to test materials (fluids) for acidity. Today, the term "Litmus Test" is often used out of context to mean 100% certainty. IE: "He past the litmus test, he's the right man for the job."
Mircat 
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