> In which case you would expect white balls.  Black ones would be expected to 
> heat the water up.
>
        I've heard that the additive to many plastics that make them 
UV-stable is black.  A friend of mine just bought a used modular plastic 
"dock" for their house on the lake.  The friggin' thing is impossible to 
walk on in the sunlight because it get so hot (black for UV reasons).

-Cory

*************************************************************************
* Cory Papenfuss, Ph.D. Electrical Engineering, PPSEL-IA                *
* Research Associate, Vibrations and Acoustics Laboratory               *
* Mechanical Engineering                                                *
* Virginia Polytechnic Institute and State University                   *
*************************************************************************


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