I have one question. How do solar bands change colour in the sunlight? I tried putting them under a normal lamp but that does nothing. Blowing a hair dryer on them does nothing either. The one thing I haven't done is get the uv light off the end of the "invisible ink" pens and shining that on them. Do you think that will work? What do you think?
I think you might have to put them in the sun.
No she wants to trigger them without going in sunlight, -_-
It's probably a chemical that reacts to the sun's rays
I thought so but I want to to trigger the reaction WITHOUT the sun's uv rays.