Enamelled art objects of the Green Vault Museum, Dresden, have suffered severe deterioration of enamel layers for around 20-30 years. The authors obtained 3 splinters, 200mg weight each of green, blue, & opaque turquoise enamel of the Aurangzeb ensemble. Model glasses of these originals were prepared which should match them closely. The investigations showed that the simple degree of network polymerization related to the SiO2/Na2O ratio is insufficient to understand their chemical properties even if one takes components such as MgO, CaO, or Al2O3 also into consideration. To understand further structural influences, IR, UV/VIS & EPR spectrometry studies were performed on the enamels, & it could be evidenced that components such as MnO, Fe2O3, CuO, CoO, PbO & SnO2 not only act as colorants or opacifiers but also as stabilisers of these materials.
