Chromo therapy, sometimes called color therapy, colorology or color therapy, is a complementary medicine method. It is said that a therapist trained in colorology can use light in the form of color to balance “energy” wherever a person’s body be lacking, whether on physical, emotional, spiritual, or mental levels. The practice is pseudoscientific, since it does not employ the scientific method Color therapy is unrelated to light therapy, a scientifically-proven form of medical treatment for seasonal affective disorder and a small number of other conditions, and photobiology, the scientific study of the effects of light on living organisms. Avicenna (980-1037), believed color to be of vital importance in diagnosis and treatment, discussed chromo therapy in The Canon of Medicine. He wrote that “Color is an observable symptom of disease” and also developed a chart that related color to the temperature and physical condition of the body. His view was that red moved the blood, blue or white cooled it, and yellow reduced muscular pain and inflammation. American Civil War General Augustus Pleasanton conducted his own experiments and published his book The Influence of the Blue Ray of the Sunlight and of the Blue Color of the Sky, published in 1876 about how the color blue can improve the growth of crops and livestock and can help heal diseases in humans. This led to a birth of modern chromo therapy, influencing scientist Dr. S. Pan coast and Edwin Dwight Babbitt to conduct experiments and publish, respectively, “Blue and Red Light; or, Light and Its Rays as Medicine” and “The Principles of Light and Color.” In 1933, Hindu scientist Dinshah P. Ghadiali published “The Spectro Chromemetry Encyclopedia”, a work on color therapy. Ghadiali claimed to have discovered the scientific principles which explain why and how the different colored rays have various therapeutic effects on organisms. He believed that colors represent chemical potencies in higher octaves of vibration, and for each organism and system of the body there is a particular color that stimulates and another that inhibits the work of that organ or system. Ghadiali also thought that by knowing the action of the different colors upon the different organs and systems of the body, one can apply the correct color that will tend to balance the action of any organ or system that has become abnormal in its functioning or condition Throughout the 19th century “color healers” claimed colored glass filters could treat many diseases including constipation and meningitis. Practitioners of Ayurveda medicine believe the body has seven “chakras,” which some claim are ‘spiritual centers’, and which are held to be located along the spine. In New Age thought each of the chakras is associated with a single color of the visible light spectrum, along with a function and organ or bodily system. According to this view, the chakras can become imbalanced and result in physical diseases but it is believed that these imbalances can be corrected through application of the appropriate color. Pituitary gland, the central nervous system and the cerebral cortex Chromo therapy has been deemed pseudoscience by its critics, who state that the falsifiability and verifiability conditions necessary to deem an experiment valid are not being met, and therefore that it has not been proven that introducing colors is the key element in the healing process which is healing its patients. Chromo therapy has also been criticized for selection bias in statistics of success for the treatment. It has also been suggested that the placebo effect may be a key factor in the healing of some patients, which could be tested for by a chromo therapy control group. Photobiology, the term for the contemporary scientific study of the effects of light on humans, has replaced the term chromo therapy in an effort to separate it from its roots in Victorian mysticism and to strip it of its associations with symbolism and magic. Light therapy is a specific treatment approach using high intensity light to treat specific sleep, skin and mood disorders.