Goethes Experimente mit „chemischen Farben”︁

In connection with the chemical aspects of his work „Farbenlehre”︁, which involved him almost his whole life, Goethe, too, performed chemicals experiments which he recorded so carefully that his notes can still he reproduced today. It deals with tests series on the reactions of metal salts solutions with yellow prussiate of potash (potassium ferrocyanide), at that time called „Berlinerblau Lauge”︁, acid-base reactions of numerous blossom dyes (today noted as anthocyanes), silver pigments and the coloured ions of manganese in its several oxidation states, called as mineral chameleon.