What Happens When Lemon Meets Highlighter #science #facts

Added: 2026-05-16

[00:00:00]This glowing lemonade-looking liquid is actually exposing a hidden chemistry reaction.

[00:00:07]Highlighter ink contains fluorescent compounds that are usually alkaline or basic in nature.

[00:00:13]Lemon juice, on the other hand, is acidic because it contains citric acid.

[00:00:18]When the two mix together, the acid changes the chemical environment surrounding the fluorescent dye molecules.

[00:00:24]That affects how the molecules absorb and emit [music] light, causing the glowing color intensity to shift.

[00:00:31]Under certain lighting, especially UV [music] light, the fluorescence becomes even more dramatic because the dye absorbs invisible ultraviolet radiation and re-emits it as visible neon [music] light.

[00:00:43]It's a perfect demonstration of fluorescence and acid-base chemistry happening in real time.