Oxalate patinas on ancient monuments: the biological hypothesis

@article{Sabbioni1991OxalatePO,
  title={Oxalate patinas on ancient monuments: the biological hypothesis},
  author={Cristina Sabbioni and Giuseppe Zappia},
  journal={Aerobiologia},
  year={1991},
  volume={7},
  pages={31-37}
}
SummaryWhewellite and weddellite, calcium oxalate monohydrate and dihydrate respectively, have been found in the form of thin surface layers on limestone and marble monuments and artifacts of various historical periods at different sites. Experimental results indicate that the formation of both minerals must be attributed essentially to the action of oxalic acid secreted by microorganisms (lichens) which live and proliferate on the stone. Oxalic acid attacks the calcium carbonate of the stone… 

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References

SHOWING 1-10 OF 13 REFERENCES

Effects of Lichens on Mineral Surfaces

The paper examines the effects and significance of lichens, in particular the crustose species, on natural rock and on building and monumental stones. Weathering and secondary products, as well as

A study of the patina called «Scialbatura» on imperial roman marbles

The so-called scialbatura is found to be due to the biochemical activity of encrusting lichens, and this activity is linked to the external treatments applied to the monuments with the aim of protecting the stone.

Lichen weathering of rock‐forming minerals: application of scanning electron microscopy and microprobe analysis

Using the scanning electron microscope with microprobe analysis, observations have been made on the weathering of rock‐forming minerals—feldspars, ferromagnesian minerals, quartz and

Lichenology and the conservation of ancient monuments: an interdisciplinary study

A study by fine arts conservators and biologists has been made on biodeterioration by lichens of historic monuments. The lichens present on the Fossanova Abbey have been identified; samples were

Paint on the Parthenon Sculptures: Part Two—Scientific Aspects

Since the early nineteenth century, scholars have wondered whether certain accretions on the surface of the Parthenon sculptures, ranging in colour from yellow to brown, may represent evidence of

Chemical activity of lichens on mineral surfaces. A review

Effects include corrosion of surfaces and precipitation of irons oxides, alumino-silica gels and other organic acids that results in deterioration of rock minerals.

Lichen Damage to Ancient Monuments : A Case Study

Description des degâts provoques en peu de temps sur des restes anciens en terre-cuite en milieu urbain (Rome) par le lichene «Lecanora muralis», montrant l'influence de la pollution atmospherique