
Litmus
Chemical Indicator
Litmus is specifically used in chemistry to indicate acidity or alkalinity, not general color change.

My teacher said that litmus is not a dye but an indicator.
Blue and Red
Remember, litmus turns only blue in alkaline conditions and red in acidic conditions, not other colors.

Her litmus paper turned red when she tested vinegar.
Testing Substance
Litmus is not the substance being tested; it's the tool to test other substances.

He realized he needed to get litmus to test his pool's water.
Compare with
Reagent
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