The invention relates to a dyestuff of plant origin, obtained from a colored part of a plant species, the cell tissues of which contain iridisomes responsible for the coloration of said part. It relates most particularly to a blue dyestuff obtained from the arils of the seeds of the plant species Ravenala madagascariensis. It also relates to compositions, in particular cosmetic compositions, especially intended for making up the skin or superficial body growths, containing said dyestuff.
