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Analytical study of the behaviour of some ingredients used in lustre ceramic decorations following different recipes

Ceramic lustre is a fine decoration obtained by a complex technical process. Although the general production technique is more or less known, it is much more difficult to specify the ingredients mixed in the ancient recipes used to produce lustre and their function during the process, especially components as mercury sulphide and iron oxide. To understand this point, mixtures of the components were previously characterised and tested to see which mixtures resulted in the desired lustre. Synchrotron-Radiation-Source X-ray Diffraction (SRS–XRD) of the fired mixtures was performed to check the changes produced in the ingredients. Also Voltammetry of immobilised Microparticles was applied to the raw pigment powders to obtain information about the redox behaviour. Square-wave voltammetry demonstrates the possibility of different deposits that can be formed in the first steps of the reduction process in the pigment mixture for lustre production, especially those related to solid-form reactions and pigment-electrolyte interactions. Moreover, SR–XRD shows the formation of different crystalline phases at the end of the process, in this case probably also related to gas–solid interactions and to a strong reduction atmosphere.