Science experiments for kids – Water fluorescent – You can use a highlighter pen (yellow, green and pink are the ones that work best) to create an invisible fluorescent solution, which appears under a UV light or, of course, a black light lamp.
Just remove the cartridge inside of a marker, Comminute and soak it in water for a few hours.
http://www.sciencecompany.com/
Torches uv cheapest are those that are used for fishing or to track the urine of Pets animal; of course it is not an activity for young children and should be taught how to safely operate the torch.
The liquid obtained can be used to write secret messages that appear only in the light uv. The experiment works, of course, also using “black light” bulbs.
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