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Ultra violet rays - detection using beads !!

My science teacher gave me 10 "beads" that have an unusual property... they change color: purple, pink, green etc, with sunlight.

My assignment is to investigate this special property of the beads, and try to determine how they do what they do. I must design and conduct, at home, two original controlled experiments pertaining to this property, one of qualitative (or semi-quantitative) nature and one of a quantitative nature. It must be well controlled only varying one factor at a time in a systematic fashion. It should show good reproducibility, with multiple (identical) trials giving relatively consistent results.

Can you suggest how I can contol and set this experiment up? Thank you

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Solution Preview

These are Ultra Violet sensitive beads. The UV-sensitive beads contain a pigment that changes color when exposed to ultraviolet radiation from the sun.

Ultraviolet (UV) light is the invisible radiation that will give you a sunburn and injure your eyes if you're not careful. The beads are not affected by light from light bulbs that do not emit ultraviolet light. The beads will remain white indoors, when shielded from sunlight.
<br>We must study,
<br>The effect of sun light and some other light source (a light bulb for example). You can test the protective qualities of sunglasses and sunscreens by using your UV detecting beads.
<br>Put all the beads together in sunlight for about 10 minutes (or till you observe a good change in color). Now classify them according to their color and specify the time of exposure (10 minutes say). The colors that develop depend on the wavelength of the absorbed UV radiation. This means that even ...

Solution Summary

Various experiments with UV beads, like detection of Ultra-violet rays in various light bulbs, efficiency of UV protection creams etc.