Several ancient cultures, including the Egyptians and Chinese, practiced chromotherapy, or the use of colours to heal. This is still used as an alternative treatment today.
Different colours have different wavelengths and frequenices.
Colour is emotional, and can therefore be used as a communciation tool which offers a different way of talking about how we feel.
Depression can change the way you see the world, and eliminate the vibrancy of naturally occuring colours.
The perfect colour of course is white, and this is what we all are striving for. If our souls were in perfect balance then all our colour vibrations would blend and we would have an aura of pure white.
White clothing expands your energetic field to other people. It is the one colour that contains all other colours. Purity, clarity. Harmony, silence, cleanliness.