Aspen, hazelnut, oak — both red and white — add their glow to the autumn hardwood forest. Carotenoid pigments, which color pumpkins, yellow squash and corn, produce yellow, gold and orange leaf coloration. Anthocyanins produce red and purple colors in raspberries, grapes, cherries and some autumn leaves. The brown coloration found in some species of oak is produced by tannins, which also color tea, some kinds of wine, and some nuts, such as walnuts, pecans and acorns. On a recent day-trip to our cabin, I photographed changing leaves in the woods along the Snake River in east central Minnesota. Each tree has a unique beauty in the shape and color of its autumn leaves.