On Tue, 16 Jul 2002, Epox wrote:

>Hello everyone. Ok, I'm wondering if anyone knows of a liquid the darkens
>color dramatically when it receives electric current. I have this little
>ideal but I don't know how I could implement it without something to study
>about it. To tell you the truth I'm thinking about making a window that can
>be triggered to change from transparent to opaque so no one can see in.

Try the lava lamp principle. In this case a small pump blows particles
into a liquid and keeps them agitated. When you turn off the pump the
heavy particles fall down slowly.

Peter

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