Sometimes people express themselves in colourful terms. They tell others how they feel by saying, "I am feeling blue" or "I am seeing red" or "I am turning green with envy". Sometimes people say that a certain person is "acting yellow" (as a coward) or "glowing purple with age" or "falling into the blackness of depression" or "rinse in white hope."
Use of the colour to affect or evaluate your own or another person's level of metabolic functioning is called Colour Therapy, known by health professionals as Chromotherapy. In brief, chromotherapy is the application of colour for purpose of healing. In contrast yellow, green and blue are therapeutic colours. Yellow activates joy, Green, the natural colour of plants and Blue is sedative and pain relieving.
The first thing the therapist should notice upon entering the patient's room is the environment in which patient is passing his/her whole day (from colour point of view). If it does not suit its nature of disease (as will be explained in other chapters), change his/her room according to the requirement of environment colour right away. You will immediately notice the change in patient's; body behaviour.
Colour can be characterised with words that how he/she feels. For strictly descriptive purpose, one could say
—    Red                -           Burns
—    Orange           -           Warms
—    Yellow            -           Tepid
Green is natural one and Violet cools the pinching sensation.
Orange is an energising colour. Orange and yellow create a laxative effect. They tend to stimulate the elimination of body wastes to such an extent that even the kidneys are cleaned. Thus orange surroundings encourage defecation and urination. You might try orange with your next bout of constipation. If you have weak kidneys you should avoid citrus juice because it stimulates micturition.