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Mike-

    You could use a photo-detecting circuit.  A bright light causes
something else to start.

                            Ed

Ed Sobey, Ph.D.
Northwest Invention Center
2420 178th NE
Redmond, WA 98052
(425) 861-8685
www.invention-center.com
www.invention-engine.com
www.kidsinvent.org
www.inventionfact.com


----- Original Message -----
From: "Kerkman, Mike" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, November 11, 2003 10:19 AM
Subject: material that reacts to light


> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related
institutions.
>
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*
>
> Hello fellow list members,
>    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.
> Thanks for any help you can offer.
> -mike k
>
>         Michael Kerkman
>         Botanical Educator
>         The Huntington Library, Art Collections, and Botanical Gardens
>         1151 Oxford Road
>         San Marino, CA 91108
>         626-405-3586
>         [log in to unmask]
>
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