what are these pens called that make drawings appear?

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leon_legeland

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hello guys, I hope you can help me here. A long time ago, I saw an advertisement for a specific type of drawing pens. They have a very special effect, though I am not even quite sure anymore what it was. You somehow color / crayon a beforehand devised picture with that special effect pen and what it does is it makes the drawing appear (or something like that). So while the painting was invisible before, after coloring it with that pen, it becomes visible. The pen makes the picture appear, so to speak. Or so I think the effect goes.




Anybody have a clue?


thanks !
 
o yes that is invisible pen. if u draw other colour on it, it will appear. it has special chemistry mixings. u can make it by ur own too. use green small citrus fluid. take a brush and use the fluid to write something. then wait it till dry. then warm up under lamp. it will appear after while
 
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