Do you know what are the characteristics of highlighter?
The highlighter has a fluorescent agent, which produces a fluorescent effect when it encounters ultraviolet rays (sunlight, fluorescent lamps, mercury lamps are more), and emits white light, which makes the color look dazzling and fluorescent.
The fluorescence of the highlighter is different from the fluorescence principle of our watch and the glow stick. The glow stick is a radioactive reaction inside, and the generated rays excite the peripheral phosphors to emit light, so they can glow without any ultraviolet rays at night.
The highlighter will fluoresce only when there is ultraviolet light. You can see it very clearly as long as the handwriting of the highlighter is close to the mosquito trap and the money detector.