The Science of Autumn Colour Have you ever wondered what makes the leaves on trees and shrubs those beautiful hues of orange, gold and red in the autumn? You could be mistaken for thinking that they have turned those rich colours but they have been hiding there all the time. Leaf colour is made up of a range of pigments and what has in fact happened is the plant has stopped producing chlorophyll, the dominant pigment which gives leaves that distinctive green hue. This in turn