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Dan,
Besides the fluorescent items suggested by Paul and Earl, which show an effect only as long as the UV is present, the only thing that comes to my mind (maybe because I have a pair sitting on my nose all the time) is the kind of eyeglasses that darken with exposure to light. These turn visibly dark in just a couple of seconds with the light from a UV LED penlight, and it takes a couple of minutes to recover. Different brands have different response times and dark to light ratios. I did a quick test with mine and don’t see any reaction to blue, green or red, so it looks like the UV is doing all the work; but I haven’t looked at a data sheet. But maybe what I’m looking through is what you’re looking for? Not inexpensive — but for a demo it may be that someone in the audience has a pair to loan.
Also, the glow in the dark products — paints, films, powders, etc — used for "frozen shadows” exhibits glows very brightly after UV exposure. But it also responds to blue very well, and to green just a little (and to yellow and red with a subtle but very interesting “anti-glow” effect if the material is already energized by a shorter wavelength). So for your purposes you would need to use filters. But it’s an illuminating <grin> way to explore that slice of the spectrum.
Tom Nielsen
www.theexhibitguys.com
On Aug 25, 2011, at 5:45 PM, Dan Zevin wrote:
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related institutions.
> *****************************************************************************
>
> Many of us have heard of and/or use UV Beads<http://www.stevespanglerscience.com/product/color-changing-uv-beads> or UV Sensitive Paper<http://www.stevespanglerscience.com/product/sun-sensitive-paper> and the like. What I'm looking for is some sort of common household item (or combination of items) that can do the same - change or otherwise "detect" UV. Perhaps there's some sort of recipe for such a thing that I'm unaware of (lemon juice and ...?), or some sort of very common plant that reacts to UV relatively quickly (and doesn't react when UV is blocked, or reacts more slowly to less intense UV).
>
> If you know of something that fits the bill, I'd love to hear from you!!
>
> Thanks for your time,
>
> Dan
>
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> Dan Zevin
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> Space Sciences Laboratory
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All the best,
Tom
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