Protective patinas applied on stony façades of historical buildings in the past

M. Alvarez De Buergo, R. Fort González

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

The ochre patina that covers the limestone façades of Palacio de Nuevo Baztán is composed of calcite, clay minerals, gypsum, quartz, potassium feldspar, alongside traces of calcium oxalates, calcium phosphates, iron oxides and hydroxides. It is a polistratified film, rich in Ca, Si, Al and P, as well as Mg, K, Fe and Cl. Results obtained indicate that the origin of the patina lies in a treatment applied on the stone in the past, consisting of a mixture of lime, gypsum, milk-derived compounds and inorganic earth pigments. This film has protected the stone on which it was applied, and should be preserved in any further stages of intervention on the stone façades.

Original languageEnglish
Pages (from-to)83-89
Number of pages7
JournalConstruction and Building Materials
Volume17
Issue number2
DOIs
StatePublished - Mar 2003

Bibliographical note

Funding Information:
This study has been financed by project 06/0108/98 of the Comunidad de Madrid (CAM) and a postdoctoral scholarship granted by the Education and Culture Board (CAM) (02/0280/1998). Thanks as well to the Research Support Centres: Centros de Asistencia a la Investigación (CAI) of UCM: Microscopı́a Electrónica ‘Luis Bru’ and Espectroscopı́a.

Keywords

  • Limestone
  • Patina
  • Protective treatment

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