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.
Pro Tip 2/3
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.
Pro Tip 3/3
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.