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 ...