Analytical investigations of the problem of “Kupferfra\” in illuminated manuscripts

摘要: The paper gives an introductory survey of the complex problem “Kupferfras”. Possible chemical changes in copper pigments, caused by environmental influences or reduction with other components paint layer cellulose are discussed. Attempts to characterize some pigments have been successful. Reactions different green can be detected infrared spectroscopy. In all decayed samples, Cl and S energy-dispersive presence basic chlorides seems proved although structural identification has not so far possible. above-mentioned results make assumption that browning carrier is a Fehling-type reaction. initial step yet quite clear, however.