Autumn Red Maple Leaves, A Lush Maple Leaf Silhouette Royalty-Free Stock Image

In autumn, leaves contain a lot of chlorophyll, so they are green in color. As the weather cools in autumn, trees slow down and the chlorophyll in their leaves diminishes, leaving only lutein to turn yellow. But maple leaves contain a special substance, anthocyanin, which is the opposite of chlorophyll. As the weather cools, the Numbers increase, turning the maple leaves red.