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rots their color. During most of the year, these yellowish colors are masked by the greater amounts of green coloring. In the fall, however, when the food-making stops, the green color disappears. The yellowish colors become visible and make the leaves part of the fall splendor.
At the same time, other chemical changes may occur that cause the formation of additional pigments that vary from yellow to red to blue. Some of them give rise to the reddish and purplish fall colors of leaves on dogwoods and sumacs.
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