In this 18 page booklet, Inger Naess has an overview of the how and why behind color therapy, including the theory behind it. She explains color therapy vibration. Color is really light split into different wave lengths which vibrate at different speeds and frequencies.
A white object reflects all colors and absorbs none whereas black objects absorb all colors and reflect none. A red object absorbs all colors except red.
Our body has seven energy centers. If these energy centers become out of balance, we may become ill or our emotions may be affected. Each color has a corresponding energy center. That color can be used to bring it back into balance.
In her booklet, Inger Naess discusses each color and its associations, area it may help and when to use it.