The colour of the facades in Siena’s historical centre: I. Glazings calcium oxalate films s.s. and other finishes on the stone materials of the Cathedral’s main facadeReportar como inadecuado




The colour of the facades in Siena’s historical centre: I. Glazings calcium oxalate films s.s. and other finishes on the stone materials of the Cathedral’s main facade - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Archaeological and Anthropological Sciences

, Volume 1, Issue 2, pp 123–136

First Online: 17 July 2009Received: 12 December 2008Accepted: 09 June 2009

Abstract

This paper focuses on the long-debated topic of the so-called calcium oxalate films: their origin and meaning but also their age and original appearance.
The restoration of the main facade of the Siena Cathedral provided a unique opportunity to this end, thanks to the possibility of an extensive and detailed sampling and as rarely happens a sufficiently accurate historical knowledge of the construction vicissitudes.
This work, mainly based on a polarising microscopy study coupled with X-ray diffraction and SEM-EDS analyses of over a thousand thin and ultra-thin sections of 400 microsamples, demonstrates that the current relicts of films are the result of alteration and decay of ancient treatments.
In most cases, these were linseed oil-based glazings the use of this substance is confirmed by historical documents and pigments.
Their role was essentially aesthetic; their use dates the beginning of the fourteenth century and continued at least until the eighteenth century.

KeywordsSiena Cathedral Stone materials Calcium oxalate films Finishes  Download fulltext PDF



Autor: Francesca Droghini - Marco Giamello - Giovanni Guasparri - Giuseppe Sabatini - Andrea Scala

Fuente: https://link.springer.com/article/10.1007/s12520-009-0009-0



DESCARGAR PDF




Documentos relacionados