Mudcat Café message #2901385 The Mudcat Café TM
Thread #129314   Message #2901385
Posted By: Donuel
06-May-10 - 01:35 PM
Thread Name: BS: COLORED Shadow?
Subject: RE: BS: COLORED Shadow?
Even if there is only ONE light source you will see a colored shadow that is the opposite color of the source.

This phenomenon can be reproduced by looking at a colored light for half a minute and then close your eyes. The after image you see with your eyes closed will be the opposite color that you were looking at. Example a reddish light will make a green after image.
A yellow light will make purple. An orange light will make aqua.

Sodium lights are yellow to reddish, mercury can be bluish ect. so the dark areas of shadow will adopt an after image color.

The reason for the after image has to do with a chemical replenishment inside your eye cones that prepare them to send another signal to the brain.