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I like Ed's idea about a photodetecting circuit. You could use it to
energize an LCD display. Depending on the size element you need, you might
be able to pick up the parts you need from the surplus electronics stores.

Please let us know what other responses you receive.


David Allan, Ph.D.
not associated with any museum, just a guy interested in science education,
and who dreams of someday opening his own hands-on museum
Midland, Michigan

> 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
>
>

> ****************************************************************************
> *
>>
>> 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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