In the movie national treasure, how did they make the invisible ink? the one that becomes visible after it is?

Question

put under a black light, nd becomes invisible again after you remove the light.

can you teach me how to do it.

pls i need this for my experiment.

Answer 1

UV Pen Marker uses Invisible Ink and you should be able to buy it at most office supply stores.......

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Answer 2

The movie never said how they made the invisible ink. It was READ with the lemon juice. Good luck!

Answer 3

Lemon juice, but this works with heat not a black light.

Answer 4

Onion juice.

Answer 5

I think you put lemon juice and a pencil, along with onion juice. :)

Answer 6

they got regular ink and then put it in a VERY small bowl and put lemon juice in it then they got an ink squirter and put it in a uv pen.

Answer 7

lemon juice

Answer 8

instead of asking people on here you could look up a way on google or ask.com.

Answer 9

its just uv pen - you can buy them from electronic stores usually

peace out :)

Answer 10

LEMON JUICE