In the fall, changes in daylight hours and temperature cause the leaves to stop the process of making food. Chlorophyll breaks down, the color green disappears, and the color changes from yellow to orange, giving the leaves the glory of autumn.
At the same time, other chemical changes that takes place, forms additional colors through the growth of red anthocyanin pigments. Some blends bring out the reddish and purple autumn color of trees such as dogwood, and other mixtures provides bright orange color to sugar maple.
The foliage of some trees shows only yellow color. Like many oaks, others predominantly exhibit shades of brown. All of these colors are due to changes in the amount of chlorophyll and other pigments left in the leaves during the fall season.
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