From my favorite surplus catalog. 

http://www.sciplus.com/index.cfm
Mood Sheet

"See psychedelic patterns the safe way! Press your hand on this 6" x 6"
sheet of liquid crystal and leave a print of swirling colors that, like
the mood ring of yore, you can use as a sign of your mood. The pattern
will blend and fade in seconds as the crystals react to temperature.
Tiny liquid crystals inside the film-like material react to heat by
changing colors. As science, it demonstrates the way liquid crystal
displays work. And you can cut it into pieces to incorporate into a
science project. Or just leave it out for guests to play with when the
party turns boring."
	91582 LIQUID CRYSTAL SHEET

>-----Original Message-----
>From: Museum discussion list [mailto:[log in to unmask]] On
>Behalf Of Kari Carlisle
>Sent: Wednesday, April 30, 2008 1:20 PM
>To: [log in to unmask]
>Subject: [MUSEUM-L] Need source for heat/touch sensitive film
>
>I need this for an interactive children's exhibit so the kids can
"make"
>their own rock art. It's a black film that when you touch it, it
changes
>colors temporarily. I found it at alsacorp.com, called Xposure Film,
but
>they have it on back order with no ETA, probably months. I need it
within
>the next month for this exhibit. Does anyone know where else I can buy
it?
>
>
>Kari Carlisle
>Museum Curator
>Fremont Indian State Park and Museum
>(435) 527-4631
>[log in to unmask]
>
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If you decide to leave Museum-L, please send a one line e-mail message to [log in to unmask] . The body of the message should read "Signoff Museum-L" (without the quotes).