Biochemie und Physiologie der Farbstoffe der menschlichen Haut
The variation in colour of the human skin is mediated by the coloured substances melanin and haemoglobin, and to a lesser degree by carotene. Spectrophotometric analysis reveals that the distribution of these three pigments within the human organism is differentiated. On the basis of the concept of threefoldness (Steiner 1917) it can be shown that one pigment predominates in each of the three systems constituting the human organism as follows: carotene/nervous-system, haemoglobin/rhythrnic-system, melanin/metabolic-limb-system. The physiological properties, the pathways of biochemical syntheses as well as the molecular structures of the three pigments also fit this pattern.