When it comes to the vexing problem of red or any other gradient, when we both agree that a thing is some color, is it really ...

Rainbow colors are frequently produced in coating ... the iodide of copper not being affected by light. They can also be permanently witnessed upon a silver plate by holding it over sulphur ...

There’s no brown in the rainbow. The color map reveals that brown is actually dark yellow. (This can be confirmed by projecting a spot of yellow light on a screen in a dark room. If you turn ...

Normally, when you look at a rainbow, the Earth’s horizon in front of ... it bends into the water and separates out into a ...