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By cynet
I definitely like the metalic paint that is used on special made motorcycles. Though it cost about $500 a galon.

A pen may cost only a few dollars, and on paper the ink would change colors in the light.

Kids would love it.
Teachers would hate it.

Reward: A few dozen pens.
By oldfred
The paint you mention is available in any Hobby Shop. It is called ALCLAD paint. It is available in several colors and will shift in the sun. It is not very expensive and can be used in any airbrush

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