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At 10:19 11/11/2003 -0800, Michael Kerkman wrote:

>    Does anybody know of a good material that rather quickly reacts to bright
>light? I don't know if this exists, but something like it would be perfect
>for an activity we are planning.  Ideally this material wouldn't react to
>room-intensity light, but if a flashlight hit it, it'd change color or
>something.
>    I know I am making this up entirely, but if there is something close I
>know you all will know about it.
>Oh, and it's gotta be safe around kids, of course.

Go for the UV sensitive beads mentioned by Kate Hintz. I've seen something
similar sold as children's wrist jewelry in the UK, advertised as reacting
to direct sunlight. These sound like the same thing and should do exactly
what you require, if you use a safe UV light source to activate them.

When I first read the question I thought, this is impossible! I am tempted
to experiment, myself. Can you share with us what you are trying to
achieve: it sounds interesting?

[log in to unmask] * http://www.interactives.co.uk
*
People forget what you said, people forget what you did,
but people will never forget how you made them feel.
*
Ian Russell

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