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I am not the expert on the stuff, but. . .

We had someone change the lighting once so that it was much more direct on
the film. The film was never able to cool off enough for handprints to make
a visible difference. 

The film also comes in different sensitivities, requiring different amounts
of heat to make visible changes. Are your hands too cold?

Joanna

-----Original Message-----
From: Informal Science Education Network
[mailto:[log in to unmask]] On Behalf Of Douglas Heuser
Sent: Monday, August 08, 2005 9:42 AM
To: [log in to unmask]
Subject: Piezoelectric Question

ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related
institutions.
****************************************************************************
*

Can piezoelectric film "go bad"?  We acquire an exhibit that had a large
surface area of piezoelectric film: it is intended for younger visitors to
make handprints on it that slowly disappear.  It suddenly stopped working.
Can direct sunlight affect the film?  Magnets?  Any ideas on how to get it
to make images again?

Thanks.

Douglas Heuser

Executive Director

SEE Science Center

200 Bedford Street

Manchester, NH 03101

603-669-0400


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