How do they make highlighter (neon) pens so bright?

I was using my highlighter and suddenly realised my amazement at how bright it is please tell me how they do this, what is the magic ingredient?!

Answer:
The brilliant colors are the result of UV-sensitive fluorescent pigments in the ink. The pigment absorbs UV light, then fluoresces that energy back out at a visible wavelength. Same principle as behind the black light paints they use in those wild posters you can get at Spencers.

If sometime you should happen to be near a "black light" bulb somewhere, pull out your highlighter, or a paper that you've highlighted, and expose it to the emissions -- you will see that same brilliant glow.
Ink is the magic ingredient. There are special types of dyes inside the ink so they glow.

http://en.wikipedia.org/wiki/highlighter...

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