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Lemma
purpurin
Colour used to substitute gold leaf in order to obtain a similar effect to that of gilding (v.). Mosaic gold is made of tin bisulphate crystals which, on the basis of the preparation process, have a yellow gold colour, more or less reddish. Cennino Cennini (end of the 14th century) - does not advise the use of mosaic gold in paintings- however, proposes a recipe for its fabrication which is essentially still followed today in industrial production.
 
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