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|Title: ||Pink! Why not? On the unusual colour of Évora Cathedral|
|Authors: ||Rosado, T|
Caldeira, A T
|Issue Date: ||2014|
|Citation: ||Rosado T, Reis A, Mirão J, Candeias A, Vandenabeele P and Caldeira AT (2014) Pink! Why not? On the unusual colour of Évora Cathedral, International Biodeterioration & Biodegradation, 94:121-127.|
|Abstract: ||The inner walls of the Evora Cathedral have a pink/orange hue of unknown origin that covers the majority
of the surface. In this work, an integrated approach was envisaged to explore whether the walls
pink colour is due to anthropic intention or to natural sources, by combining material characterisation of
the surface layers with its microbiological study.
Mortars material characterisation showed no presence of inorganic chromophores and therefore the
use of inorganic pigments. The microbiological characterisation revealed that Rhodotorula yeast is the
major microorganism isolated from the stained sites. Carotenoids were identified in the mortars from
pink walls and in the isolated yeast culture by Raman and FTIR analysis. In this context, carotenoids
detection could be tied mainly to the development and metabolic activity of Rhodotorula sp. in the
surface of the walls. The extension of Rhodotorula sp. colonisation and the results obtained by the
spectroscopic analysis are a strong indication that this microorganism is one of the main agents
responsible for the colour alteration on the inner walls of Evora Cathedral.
Therefore, the perceived pink colour of the Cathedral is due to natural processes rather than to Human
|Appears in Collections:||CQE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
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