According to alchemical european tradition, in order to transform lead into gold, the savant has to start with producing a «melanosis». During this operation, lead gets rid of its impurity by releasing intense black putrid matter. In Psychology and Alchemy, C.G. Jung suggests a psychoanalytic interpretation of melanosis. According to him this operation symbolically represents the rite of passage in which the patient progressively detach himself from the unconscious schemes that locks him up. Melanosis is a series of 9 carbon printed photographs that try to trace the 9 symbolic and enigmatic steps that go along with the emergence of certain kinds of esoteric knowledges.