Colours

“(…)Chromotherapy, which was developed in the 1920s, is regularly used in hospitals to treat ailments with coloured light.  Blue light is used to soothe inflammation and the pain of arthritis and to reduce high blood pressure.  It is administered to premature babies to prevent brain damage or death through an underdeveloped liver, and to treat jaundice in newborn babies.  Red light is used to treat poor circulation, stiff joints and migraine.(...)”

http://www.come-alive.co.uk/colour-your-life.htm