You can purchase photochromic (color changing) paints at most automotive paint stores.
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Photochromic lenses are polarized for better glare protection and also will have a very unique, colorful look to them.
eye glasses
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Photochromic Sunglasses are the eyeglasses that gets darken when exposed to the sun. Created by Corning in the late 1960s and popularized by Transitions in the 1990s,these are also sometimes called photochromatic. Lenses in photochromic sunglasses rely on a specific chemical reaction to UV radiation.
they turn darker in sunlight
Photochromic Sunglasses are the eyeglasses that gets darken when exposed to the sun. Created by Corning in the late 1960s and popularized by Transitions in the 1990s,these are also sometimes called photochromatic. Lenses in photochromic sunglasses rely on a specific chemical reaction to UV radiation.
they are materials that have a high tendency to do absolutely nothing .
They are normally used for security markers or ultraviolet warning sensors. They can easily be mixed with base paint and used indoors for your own personal use.
It means changing colour in resonse to light.
You can buy acrylic paint conditioners on line at : http://www.ibc34.com/VaporWax.html
Start with Ace Hardware. They have lots of paint.