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how can i make invisible ink which is visible under UV light?

how can i make invisible ink which is visible under UV light?

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BLUEBLOBS25 years ago
Take a paint brush. Soak it in some lemon juice. Paint on a piece of paper. Wait until you can't see any of the lemon juice on the paper. If you look at it under a UV light, it is visible!
I hope that helps.
-BLUEBLOBS2

Can lime juice produce the same effect?

Or just lemons?

kewlman6 years ago
try using a highlighter!!!
Many laundry detergents and especially color-safe bleach are loaded with UV fluorescent dyes. The quinine in soda water glows weakly too. Your best bet is probably a glow in the dark paint, as I mentioned over here.

Try carrying a black light around your house at night. You might discover something you already have.
Sandisk1duo8 years ago
shehabshameer (author) 8 years ago
your comment got me thinking.. since all white substances glow under uv light maybe we could break something down and make a white paste or ink...
BeanGolem8 years ago
It'd be cool to see if you could make some UV ink from flower petals that give off UV light! Now that would be an interesting I'ble.

Anyway... not sure how.