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Ultraviolet light, or UV, is just beyond visible violet in the spectrum.
紫外線（UV）頻率恰好在可見紫色光之外。
Its wavelength is too short to be visible to the naked eye, but you see it working when fluorescent colors glow!
紫外線的波長太短而肉眼無法看到，但是熒光色發光的時候你就能看到紫外線照射的效果！
Regular dyes just absorb UV along with all the other wavelengths they don’t reflect, so you don’t see any evidence of it.
一般的染料只吸收紫外線和所有其他不反射的光，因此你無法看到紫外線。
But, fluorescent dyes contain substances that respond to UV.
但是，熒光染料含有對UV起反應的物質。
Some of the molecules in these fluorescent dyes are excited by UV energy, and afterwards, as the energy level within these molecules decreases, they release part of that extra energy as visible light.
這些熒光染料中的一些分子被UV的能量激活，然后，隨著這些分子的能量水平下降，它們就會釋放一部分額外的能量形成可見光。
So fluorescent dyes turn invisible energy into visible light, and that’s how the magic trick works!
因此，熒光染料把不可見的能量轉換成了可見光，這就是魔術的原理！
They don’t reflect more energy than they receive, but they do reflect more visible light, converted from parts of the spectrum we can’t see.
它們并不是反射出所接收的額外能量，而是反射出了更多的可見光，這些可見光是由肉眼看不到的波段轉換而來的。
譯文為可可英語翻譯，未經授權請勿轉載!
