Colorimetry to assess the visual impact of dust deposition on mosaics at sheltered archaeological sites

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Cabello Briones, Cristina and Mayorga Pinilla, Santiago and Vázquez Moliní, Daniel and Álvarez Fernández-Balbuena, Antonio (2021) Colorimetry to assess the visual impact of dust deposition on mosaics at sheltered archaeological sites. Heritage Science, 9 (40). ISSN 2050-7445 (e)

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Official URL: https://doi.org/10.1186/s40494-021-00509-0



Abstract

One of the most important alteration factors for archaeological sites is the deposition of dust, primarily onto horizontal surfaces, because it affects both the conservation state of the remains and their appearance. The deposition is responsible for visual changes that prevent proper appreciation of the site, and this is especially negative for the decorative elements such as mosaics. Dust deposition has been seen as a significant problem in sheltered sites as opposed to those located in the open air, where deposits are regularly washed away. However, there is a lack of knowledge on the visual effects of dust on sheltered archaeological remains despite the fact that this information could help to determine cleaning regimes. This research has been undertaken at the House of Hippolytus, a Roman villa located on the outskirts of Complutum, situated where the city of Alcalá de Henares (Spain) stands today. The site was covered with a partially enclosed shelter in 1999 and it contains a magnificent mosaic in the central area. This ornamental floor is the center of attention for visitors and has often been used as a promotional image because of its high artistic value. This study has objectively evaluated the visual changes (color and spectral characteristics) of the mosaic at the House of Hippolytus before and after being cleaned with dry and wet systems using a novel approach based not only on a spectrophotometer (CM-2600d Konica Minolta®) but also on a LumiCam® 1300 camera (Instrument Systems GmbH). Although wet cleaning implies the use of water, which is a decay factor, it has been found to be the best option for recovering the original aspect of the mosaic.


Item Type:Article
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Received: 12 December 2020; Accepted: 11 March 2021; Published online: 31 March 2021.

This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativeco mmons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

Uncontrolled Keywords:Chroma, Lightness, Hue angle, Reflectance, LumiCam®, Spectrophotometer, Complutum
Subjects:Sciences > Physics > Optics
Humanities > History > Archaeology
ID Code:64801
Deposited On:14 Apr 2021 15:33
Last Modified:15 Apr 2021 08:05

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