Academic thesis

Matthias Kilchhofer: Calcium oxalates on surfaces of natural stones and plasters back

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Overview:  
Abstract: Calcium oxalates are often found as an essential part of patina films on natural stone and plasters. As hardly soluble salts, calcium oxalates in natural patinas act as a protective layer against acid solutions und decay caused by the atmosphere. Based on this knowledge, a conservation method which generates an artificial layer of calcium oxalates has been developed by the opificio delle pietre dure in Flor-ence, Italy. By means of an aqueous solution of ammonium oxalate, a thin layer of calcium oxalate can be produced on calcareous surfaces like marble and fresco. This artificial film of calcium oxalates has a maximum thickness of 10 μm and acts demonstrably as a surface protector against acid solutions. It is, therefore, a pre-ventative conservation treatment for natural stone and plasters against decay, caused by the atmosphere.

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Keywords: calcium oxalates, preventive conservation, stone conservation
Details:
  • academic institution: Hochschule der Künste Bern
  • kind of theses:  Diplomarbeit
  • main Tutor:  Ueli Fritz
  • assistant Tutor:  Jürgen Pursche
  • date:  2005
  • Language:  German
  • pages:  113
  • pictures:  67
 
Contact:
 
Matthias Kilchhofer
mkilchhofer@[Diesen Teil loeschen]hotmail.com

 
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Creative Commons Lizenzvertrag This work is licensed under a Creative Commons BY-NC-ND 3.0 Germany License.
DOI (Digital Object Identifier) 10.5165/hawk-hhg/104

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