Lemon juice can "erase" yellow highlighter ink made with pyranine because pyranine is a pH-sensitive fluorescent dye. When exposed to the acid in lemon juice, the pH drops, which changes the chemical structure of the dye and stops it from absorbing and emitting light the same way, causing the bright yellow color to fade or disappear. This isn't true erasing, but rather a chemical reaction that neutralizes the dye's visible properties. #science #chemistry #physics #learning #facts #highlighter #ink #fluorescent #dye
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