Nem tudo o que brilha é ouro: douramento com folha de prata, outro meio para um fim ResumoComplementando e enriquecendo retábulos e imagens, o uso de folhas metálicas tornou-se paradigmático dos interiores religiosos portugueses nos séculos XVII e XVIII. Apesar do ouro ter sido sempre favorecido desenvolveram-se, simultaneamente, técnicas alternativas para atingir o desejado lustre dourado, com recurso a folhas metálicas brancas cobertas com velaturas coloridas. Referências históricas, presentes em numerosos textos de técnicas artísticas, indiciam que estas técnicas de contrafação são praticadas desde há muito. Pouco mencionado, o processo de prateamento é genericamente descrito como idêntico ao de douramento, sendo dada muito mais atenção aos vernizes dourados a ser aplicados sobre a superfície prateada, o que permite que a sua evolução material e técnica seja seguida. Baseado num inquérito a estas referências, é feito um enquadramento destes desenvolvimentos e da terminologia associada, tendo presente que o fulgor alvo das folhas de prata também brilhou por direito próprio. Palavras-chave AbstractComplementing carved wood altarpieces and sculptures, the use of metallic leaves became paradigmatic of Portuguese religious ambiences during the 17th and 18th centuries. Although gold has always been favoured, alternative techniques to attain the desired golden lustre were developed simultaneously, mainly with the use of white metallic leaves covered with coloured glazes. Written historic references, present in various technical art texts, indicate that these imitation gildings have been a long time practice. Seldom mentioned, the silvering part of the process is generically described as identical to gilding, while much more attention is given to the golden glazes to be applied over the silvered surface, allowing for their material and technical evolution to be followed. Based on a survey of these historical references, an outline on these developments and the associated terminology is made, keeping in mind that the silver leaf's white glitter also shone on its own right. Article / ArtigoAll that glitters is not gold: silver leaf gilding, another means to an end
The visible polychromy of a wooden sculpture representing St. John the Evangelist, fromMuseu Nacional de Arte Antiga, Lisbon (Portugal) presents several techniques that complement each other on the creation of a sumptuous estofado. This case-study allowed the survey on gilding, silvering and polychromy practices, and observations on their execution are briefly reported and documented with results from a multi-analytical approach. Examination included digital photomicrography and the observation of micro-samples cross-sections, while material identification resorted to several analytical methods that included scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDS) and X-ray diffraction (XRD).
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