Abstract
A new procedure for the production of red gold purples was developed at the “Manufacture de Sèvres” for the production of high-quality red gold enamels. A significant improvement in the synthesis of the red gold purple n° 601 compared to the historical method used since the 18th century was achieved by optimising, on physico-chemical bases, the conditions of synthesis of the starting gold colloid. In particular, the use of a purer tin precursor, a better control of the reaction times and of the pH conditions via the use of a hydrogenocarbonate buffer allowed a complete control of the tint of synthesised purple and of the resulting red enamel. This method allows the completely reproducible synthesis of consecutive batches of a constant red colorant, which ultimately permits a standardisation in the amount of gold added into other goldcontaining enamels (more than 8 other enamels). Compared to the other red enamels synthesised throughout his whole history, the new n° 601 can be classified among the most beautiful and valuable red enamels ever produced at the “Manufacture de Sèvres”.
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Olivier Dargaud} graduated in chemistry at the “Université Pierre et Marie Curie” in Paris (France) and has just obtained a Master degree at the “Ecole Nationale Supérieure de Chimie de Paris”. He is now beginning a PhD in chemistry studying nucleation phenomena in glasses at the “Université Pierre et Marie Curie” in collaboration with “St-Gobain Recherches”
Lorenzo Stievano studied industrial chemistry at the “Università Ca's Foscari” in Venice (Italy), where he obtained a PhD in Chemical Sciences in 1999. Since 2001, he is associate professor of inorganic and materials chemistry at the “Université Pierre et Marie Curie” in Paris (France). His main research activities are centred on the study of the structure and of the surface reactivity of inorganic materials.
Xavier Faurel obtained his degree in chemical engineering of ceramics and glasses at the “Conservatoire National des Arts et Métiers” of Paris in 1980. Since then he has been responsible for the R&D laboratory of the “Manufacture Nationale de Céramiques de Sèvres” (France). He is in charge of developing and promoting the scientific and technological investigation in the domain of ceramic materials at the Manufacture.
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Dargaud, O., Stievano, L. & Faurel, X. A new procedure for the production of red gold purples at the “Manufacture nationale de Céramiques de Sèvres”. Gold Bull 40, 283–290 (2007). https://doi.org/10.1007/BF03215601
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DOI: https://doi.org/10.1007/BF03215601