Chinese blue (BaCuSi4O10) and Chinese purple (BaCuSi2O6) were two synthetic pigments prepared in China especially during the Han dynasty. Chinese purple is a metastable compound that slowly converts to Chinese blue. Both are related to the synthetic pigment Egyptian blue (CaCuSi4O10) first prepared in Egypt during the Early Bronze Age (from 3000 BC onward). We will present results on how to prepare Chinese purple in the laboratory using readily available materials such as barite, malachite, and quartz. A flux is added to lower the processing temperature. We explore variations in stoichiometry, temperature, and processing time as well as the amount and type of flux. The equipment needed is minimal: crucibles and a programmable ceramics kiln. The latter can often be found in art departments at many primary and most secondary schools. Manufacture of Chinese purple is of special interest to students interested in art and chemistry and is a unique opportunity for collaboration between teachers of art and science.

On the production of Chinese Purple in the art studio and chemistry laboratory

249th National Meeting (2015)

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