You can purchase photochromic (color changing) paints at most automotive paint stores.
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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.
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they turn darker in sunlight
thermo chromic ink is the one that changes colour or shape in temperature but... photo chromic ink is what changes colour or shape in light.
Photochromic lenses change with the light they get dark in the sun and clear indoors, giving you UV protection and making life easier. if you are looking for photochromic lenses this is the site I usually follow Eyeglass direct
You can buy acrylic paint conditioners on line at : http://www.ibc34.com/VaporWax.html
I would like to buy a paint meter to show the thickness of the paint on my automobile. Can you buy these in any retail stores?
Start with Ace Hardware. They have lots of paint.
You can't. You have to buy new paint.
It means changing colour in resonse to light.
You can buy model airplane paint online at http://www.scalehobbyist.com/. You can also buy model airplanes and other accessories there.