Trees and Autumn 3 (3/6)

The red color of the leaves comes from different types of pigments, called anthocyanins. They owe their color and some fruits such as raspberries and capins, for example. Unlike carotenoids and xanthophylla, anthocyanins are not constant in the leaves, but are synthesized in autumn. They are formed by the reaction of the sugars left in the leaves and the molecules of the residual juices of the tree. The color produced by anthocyanins depends on the acidity of cellulite juices. If the medium is highly acidic, red shades are formed, with weak acidity the colors are in the blue-violet part of the spectrum.