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Determining the patina colors applied UV-Vis-NIR spectroscopy and munsell systems in the main façade of the cathedral of Santo Domingo, Dominican Republic

Authors: Flores Sasso, Virginia; Ruiz Valero, Letzai; Pérez, Gloria; Frutos Vázquez, Borja; Prieto Vicioso, Esteban; Martín-Consuegra, Fernando;

Determining the patina colors applied UV-Vis-NIR spectroscopy and munsell systems in the main façade of the cathedral of Santo Domingo, Dominican Republic

Abstract

[ES]: La fachada principal de la Catedral de Santo Domingo, Primada de América, es la más importante de la arquitectura colonial de la primera mitad del siglo XVI en América, la cual está construida en piedra caliza coralina. El color de su fachada se ha ido perdiendo por diversos motivos, quedando apenas restos de la pátina original que cubría las piedras, la cual nunca había sido estudiada y valorada hasta este momento. Por tal motivo, el objetivo principal de esta investigación es determinar el color de la pátina histórica presente en la fachada principal de la Catedral de Santo Domingo mediante la aplicación de UV-Vis-NIR Spectroscopy y comparando el color con el Sistema Munsell en seco y en húmedo. Para ello se seleccionaron dos áreas representativas de la pátina y una de la piedra natural que sirvió de referencia, todas ubicadas en la parte derecha de la fachada principal. Las muestras (CSD-S1) y (CSDS2) corresponden a la pátina mientras que la (CSD-S3) corresponde al color natural de la piedra. Los resultados obtenidos con el UV-Vis-NIR Spectroscopy colocan todos los valores en el primer cuadrante superior derecho con valores de a* y b* positivos y luminosidad mayor de 50, coherentes con el aspecto del material de la fachada. Con el Sistema Munsell, los resultados en seco arrojaron que la muestra CSD-1 se ubica en 7.5 YR 6/6, CSD-S2 en 5 YR 6/8 y CSD-S3 en 10 YR 7/4; y en húmedo los valores obtenidos son: CSD-1 se ubica en 7.5 YR 6/8, CSD-S2 en 5 YR 5/8 y CSD-S3 en 10 YR 6/6.

[EN]: The main facade of the Cathedral of Santo Domingo, Primate of America, is the most important of the colonial architecture of the first half of the 16th century in America, which is built of coralina limestone. The color of its façade has been lost for various reasons, leaving only remains of the original patina that covered the stones, which had never been studied and valued until now. For this reason, the main objective of this research is to determine the color of the historical patina present in the main façade of the Cathedral of Santo Domingo by applying UV-Vis-NIR Spectroscopy and comparing the color with the Munsell Systems in dry and wet conditions. Two representative areas of the patina and one of the natural stone that served as reference were selected, all located in the right part of the main façade. The samples (CSD-S1) and (CSD-S2) correspond to the patina while the (CSD-S3) corresponds to the natural color of the stone. The results with the UV-Vis-NIR Spectroscopy place all the values in the first upper right quadrant with values of a* and b* positive and luminosity greater than 50, consistent with the appearance of the material of the facade. With Munsell System, dry values showed that the CSD-1 sample is located at 7.5 YR 6/6, CSD-S2 at 5 YR 6/8 and CSD-S3 at 10 YR 7/4, and at wet values are: CSD-1 located at 7.5 YR 6/8, CSD-S2 at 5 YR 5/8 and CSD-S3 at 10 YR 6/6.

Trabajo presentado al 7th Euro-American Congress on Construction Pathology, Rehabilitation Technology and Heritage Managament (REHABEND), celebrado en Cáceres (España) del 15 al 18 de mayo de 2018.

Peer reviewed

Keywords

Sistema Munsell, Patina, Catedral de Santo Domingo, UV-Vis-NIR spectroscopy

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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