During the twentieth century, colour became a valuable tool for hospitals. Green was a popular choice. Surgeons first added “spinach-leaf green” to their clothing in 1914 to reduce glare from traditional hospital whites. In the 1930s, hospital decorators used green to influence patient moods. It carried associations with nature, growth and recovery. Tiled surgical suites, patient rooms, clothing and instruments all went green in the post World War Two era.