How to make purple paint?

To paint a beautiful eggplant in still life, to outline the flower of the same name, to create a dream sunset: the purple color is certainly very present in the world of painting, as in the real one. You must know that, among vegetables, the presence of the purple color is often a symptom of the presence of anthocyanins. And therefore of water-soluble dyes that are found in particular in cornflowers, blackberries, cherries, grapes … and so on.