It is often asserted that people rarely dream in colour. This is untrue. When the dreamer particularly emphasizes having dreamed in colour, this simply means that he remembers the colours.  The following should be considered when interpreting the individual colours:
Black must be regarded as a signal of a state of non-awareness in the sense of a standstill.
White can also be a reference to a state of non-awareness, like that which exists before the start or after the end of the psyche's conscious life. White can thus indicate forebodings of death.
Yellow is like gold. In a dream, it is the color of mental, intuitive activity.
Red  is the symbol for the dynamics of life. It is also a symbol for animal instincts and aggression.
Orange is a particularly strong signal for activity.
Blue is the color which symbolizes the intellect. It indicates clear-headed deliberations and dispassionate thinking.
Purple is a signal for especial significance.
 As new life begins in spring, when fields and meadows turn a fresh green sheen, this colour has an extremely positive meaning. 
Colour test series over a period of years showed that brown is preferred by neurotics and indicates unconscious complexes.
Violet in a dream symbolizes conflict situations arising from the opposition of body and intellect.