Non‐destructive ‘in situ’ Raman study of artistic glasses

Abstract

Abstract A non‐destructive ‘in situ’ Raman spectroscopic study was carried out on 28 artistic glasses grouped in eight age classes between 1750 and 1940, in order to characterize the authenticity (age) of these objects. Other non‐‘in situ’ instrumental methods which require only micro amounts of sample, should be avoided in this case owing to the great brittleness of the samples. Although it was not found possible to characterize the age of the samples from the Raman spectra, which were very similar for all the different glasses examined, nevertheless, the intensity of the fluorescence band increased with the age of the samples. The logarithm of the ratio between the 1080 cm−1 Raman band intensity and that of the fluorescence band, obtained from the spectra where the fluorescence band was kept at the same intensity for the different samples, shows a linear relationship with the age of the glasses, and therefore constitutes a spectroscopic marker for the characterization of the authenticity of the samples.

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