Color degradation mapping of rock art paintings using microfading spectrometry

Carrión-Ruiz, Berta; Riutort-Mayol, Gabriel; Molada-Tebar, Adolfo; Lerma, José Luis; Bonilla, Valentín Villaverde

doi:10.1016/j.culher.2020.10.002

Cited by 9 publications

(7 citation statements)

References 27 publications

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“…Such methods have been developed to improve the characterization of colors for recording of rock art sites [124] and sometimes include the development of low-cost software allowing the colorimetric recording from complete image scenes with commercial cameras [123]. In situ microfading spectrometry has been tested for mapping color degradation of rock art paintings [125], and colorimetric analysis testing the possibility that color gradations might be quantifiable for purposes of dating has been experimented on petroglyphs [126].…”

Section: Methods For Investigation Of Rock Artmentioning

confidence: 99%

The Sustainability of Rock Art: Preservation and Research

Zerboni

Villa

et al. 2022

Sustainability

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Rock art is a widespread cultural heritage, representing an immovable element of the material culture created on natural rocky supports. Paintings and petroglyphs can be found within caves and rock shelters or in open-air contexts and for that reason they are not isolated from the processes acting at the Earth surface. Consequently, rock art represents a sort of ecosystem because it is part of the complex and multidirectional interplay between the host rock, pigments, environmental parameters, and microbial communities. Such complexity results in several processes affecting rock art; some of them contribute to its destruction, others to its preservation. To understand the effects of such processes an interdisciplinary scientific approach is needed. In this contribution, we discuss the many processes acting at the rock interface—where rock art is present—and the multifaceted possibilities of scientific investigations—non-invasive or invasive—offered by the STEM disciplines. Finally, we suggest a sustainable approach to investigating rock art allowing to understand its production as well as its preservation and eventually suggest strategies to mitigate the risks threatening its stability.

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Section: Methods For Investigation Of Rock Artmentioning

confidence: 99%

The Sustainability of Rock Art: Preservation and Research

Zerboni

Villa

et al. 2022

Sustainability

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“…Data of the three axes were used to obtain the total color difference ΔE* using the formula ΔE* = {(ΔL*)2 + (Δa*)2 + (Δb*)2} 1/2 (Lettieri et al , 2021; Carrión-Ruiz et al , 2021).…”

Section: Resultsmentioning

confidence: 99%

“…The color change was evaluated using the CIE, L*a*b* system because of its convenience for archaeological applications (Carrión-Ruiz et al , 2021; Molada-Tebar et al , 2018).…”

Section: Resultsmentioning

confidence: 99%

Hibiscus sabdariffa L. calyces’ and argon DBD plasma: potential eco-friendly cleaners for fire-damaged silver gelatin prints

ELattar

Darwish

Rashed

et al. 2021

PRT

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Purpose This paper aims at examining the potentiality of using Hibiscus sabdariffa L. calyces’ (Hs) aqueous extract to remove soot stains from the surface of fire-damaged silver gelatin prints. It further studies the cleaning efficiency and impact of both a contact method and a noncontact method with argon dielectric barrier discharge plasma (DBD Ar. plasma) on the different properties of silver gelatin prints. Accordingly, it prompts using economic, eco-friendly materials and methods in the photograph conservation field. Design/methodology/approach To achieve the aims of this paper, four silver gelatin prints were stained with soot and treated with the (Hs) aqueous extract as a contact method and DBD Ar. plasma combined with the aqueous extract as a noncontact method. The assessment was carried out using digital microscopy, atomic force microscopy and spectrophotometer to study the efficiency of the tested treatments and their impact on the surface of the photographs. FTIR was used to monitor the state of the binder after cleaning. Furthermore, the pH and the mechanical properties were measured. Findings The contact method resulted in lower concentrations of (Hs) extract that efficiently cleaned the surface without causing any stains or damage to the treated photographs. The noncontact method (plasma with an aqueous extract) proved to be less effective in cleaning and made the binder more susceptible to deterioration. Originality/value This paper reveals the success of (Hs) aqueous extract in cleaning soot on vulnerable photographs’ surfaces.

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“…The color change of samples was evaluated using the CIEL*a*b* (CIE76) system as it is more suitable for archaeological applications [36,37] [38,39]. This analysis was performed at the Wood Conservation Laboratory, Faculty of Archaeology, Cairo University.…”

Section: Color Changementioning

confidence: 99%

“…The b+ equals yellow and b-indicates blue [39,44]. Data of the three axes were calculated to obtain the total color difference ΔE* according to the formula ΔE*ab = [(ΔL*) 2 + (Δa*) 2 + (Δb*) 2 ] ½ [36,38]. Table 2 shows that the ethyl lactate treatments achieved satisfied color change values i.e., lower ΔE* values after treatment compared to the control means better cleaning.…”

Section: Color Change Measurementsmentioning

confidence: 99%

Ethyl Lactate: A New Prospective Eco-friendly Cleaner for Silver Gelatin Prints

et al. 2021

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This study is the first involving the use of ethyl lactate as a green solvent on vulnerable photographs in an endeavour to protect the environment by using eco-friendly economic materials and methods in photograph conservation field. The paper is an experimental study aims at evaluating the efficiency of Ethyl lactate (E.L.) as an eco-friendly solvent in the removal of adhesive stains found on developed-out (DOP) silver gelatin prints. For achieving the paper objectives, three silver gelatin prints were stained with an adhesive and treated with three concentrations of E.L. The study assessment was implemented by digital microscope, atomic force microscope, and spectrophotometer to observe the changes which may occur on the surface post treatments; in addition to the use of attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy to investigate the gelatin binder layer after treatment. Moreover, the mechanical properties and the pH value were measured. The three concentrations of ethyl lactate were efficient in cleaning the surface without causing any damage to the structure of photographs. The paper proved the success of ethyl lactate treatments as an eco-friendly solvent in cleaning adhesive stains from developingout silver gelatin prints.

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Color degradation mapping of rock art paintings using microfading spectrometry

Cited by 9 publications

References 27 publications

The Sustainability of Rock Art: Preservation and Research

The Sustainability of Rock Art: Preservation and Research

Hibiscus sabdariffa L. calyces’ and argon DBD plasma: potential eco-friendly cleaners for fire-damaged silver gelatin prints

Ethyl Lactate: A New Prospective Eco-friendly Cleaner for Silver Gelatin Prints

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