Once upon a time, when I was a wee little
geek girl, I was fascinated by manuals of cheesy
scientific experiments for kids. One such
experiment (theoretically to demonstrate
capillary action) involved sticking a white
carnation into a glass of
ink, and watching the bugger
change color.
If you put the flower in green ink, it would turn green...
in red ink, it would turn red...
and so forth, very consistently.
So, I eventually formulated the hypothesis that if you stuck a carnation in a glass of invisible ink, it would turn invisible!
Efforts to test this hypothesis were thwarted by the practicality of adults...and my world was the sadder for it...