ABSTRACT
The aim of our study work is to reproduce, at laboratory scale, the synthetic process of these pigments and to study its evolution. In studies made by other authors, the effect of temperature was studied (Ciomartan et al. 1996); in our case, temperature was kept constant and the evolution of the process on terms of the roasting time is studied. Given the specificity of Raman microscopy, we use it to identify lead white and all the compounds formed at different stages of the transformation. Our results have been complemented with X-ray diffraction (XRD) experiments. In addition, we have carried out a colorimetric characterization of the products formed at each stage (De la Roja et al. 2007). Considering the previous studies (Burgio et al. 2001), our samples have been excited at low power with a He-Ne laser (632.8 nm) as excitation source.
