Colorimetric Evaluation of Pictorial Coatings in Conservation of Plasterworks from the Islamic Tradition

Montero, Francisco José Collado; Castillo, Ana Isabel Calero; Melgosa, Manuel; Medina, Victor

doi:10.1080/00393630.2018.1460924

Cited by 9 publications

(5 citation statements)

References 16 publications

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“…It should be pointed out that Paraloid®B72 presents an intermediate behavior in the treated samples, and was not, in any of the cases, one of the products that most changed the color of the sample. These results therefore agree with previous colorimetric studies [9,28,29]. However, it is worth mentioning that this product presents some disadvantages when applied, especially in wet environments and at high concentrations, since the resin tends to reticulate, and then it may lose reversibility, reduce permeability and may also produce opacity.…”

Section: : Color and Spectral Metrics Comparing The Mean Reflectances...supporting

confidence: 91%

“…We may also consider as positive results those obtained when we globally analyzed the samples treated with ethyl esters (Nanoestel especially). This product is highly compatible with the treated substrate, which would make it a suitable product for the treatment of these decorations and whose effectiveness in plaster supports has already been evidenced in other studies [28]. As for the Bioestel1200, it seems to produce relatively high differences in color and spectral metrics for the AZ pigment.…”

Section: : Color and Spectral Metrics Comparing The Mean Reflectances...supporting

confidence: 57%

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Colorimetric and spectral data analysis of consolidants used for preservation of medieval plasterwork

Martínez

Calero

Valero

2020

Journal of Cultural Heritage

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Section: : Color and Spectral Metrics Comparing The Mean Reflectances...supporting

confidence: 91%

Section: : Color and Spectral Metrics Comparing The Mean Reflectances...supporting

confidence: 57%

Colorimetric and spectral data analysis of consolidants used for preservation of medieval plasterwork

Martínez

Calero

Valero

2020

Journal of Cultural Heritage

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“…We calculated this colour difference following the CIEL*a*b* formula ∆E* ab,10 . Even though the colour difference CIEDE 2000 (IOS/CIE 116-6:2014) is currently the recommended one by the ISO and the CIE for certain reference conditions, in this case, as not all the required conditions were fulfilled, it was considered appropriate to use the CEILAB colour difference formula which is, on the other hand, the most widely used in the cultural heritage research field [37,38].…”

Section: Analysis Of Colour Variations Of the Pictorial Layermentioning

confidence: 99%

Preventing the Undesired Surface Veiling after Nanolime Treatments on Wall Paintings: Preliminary Investigations

López-Martínez

Otero

2021

Coatings

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During the last decades, the discovery of nanolime and its introduction in the field of Cultural Heritage has entailed a significant advance for the consolidation of historic wall paintings. Nevertheless, its use is not completely generalized yet within the conservation practitioner’s community due to its undesired white veiling deposit on the surface after treatment which usually covers the pictorial layer. Given the scarcity of existing literature which specify how to mitigate this undesired side-effect, the aim of this work is to carry out the first assessment of possible cleaning and treatment methods to eliminate those deposits and, at the same time, to analyse their effects on the consolidation properties. To do that, we have developed laboratory fresco wall paintings specimens. After applying an artificial ageing cycle to all of them, we consolidated them with CaloSil IP25, one of the most currently used commercial product in the practice. The elimination of the whitish deposits has been investigated with different methods: (1) wiping off the superficial excess of product immediately after each application during the treatment; (2) mechanical cleaning (scalpel) after consolidation; chemical cleaning with rigid gels of water (3), ethylenediaminetetraacetic acid (EDTA) (4) and citric acid (5) after consolidation. The effectiveness of each cleaning method has been assessed by non-destructive methods before and after the consolidation, and repeated after cleaning, by measuring differences in colour, water absorption by capillarity (i.e., sponge test), superficial adhesion (i.e., Scotch Tape Test) and by quantifying the thickness of the deposits eliminated by means of photogrammetry. Results show that both the mechanical cleaning and the removal of the excess of product after each application during the treatment yielded the most promising results for conservation practice.

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“…En segundo lugar, se ha calculado la diferencia de color siguiendo la fórmula CIELAB ΔE* ab,10 . Si bien la fórmula de diferencia de color CIEDE 2000 (ISO/CIE 116-6:2014) es actualmente la recomendada por la ISO y por la CIE para determinadas condiciones de referencia, en este caso, al no cumplirse todas las condiciones requeridas se ha considerado oportuno emplear la fórmula de diferencia de color CIELAB que es, por otro lado, la más difundida en el campo de la investigación del patrimonio cultural [16][17].…”

Section: Análisis De Las Variaciones Del Color De La Capa Pictóricaunclassified

Consolidation tests in archaeological wall painting: comparing treatments depending on the painting technique

2021

Self Cite

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Consolidation is a treatment of great importance for archaeological wall paintings due to their state of preservation, in which the lack of cohesion of the mortar and the pulverulence of the pictorial layer are common. The objective of this work has been to evaluate consolidation tests that have been carried out on decontextualized fragments belonging to five different wall paintings (from different periods and with differences in their state of conservation and in their painting techniques). For this, two of the most used treatments in consolidation of archaeological coatings, such as an acrylic resin and ethyl silicate, have been compared with two treatments that use nanoparticles, such as nanolimes and nano ethyl silicate, together with a bioconsolidation treatment used until present mainly for the consolidation of stone material: bacterial carbonatogenesis.

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Colorimetric Evaluation of Pictorial Coatings in Conservation of Plasterworks from the Islamic Tradition

Cited by 9 publications

References 16 publications

Colorimetric and spectral data analysis of consolidants used for preservation of medieval plasterwork

Colorimetric and spectral data analysis of consolidants used for preservation of medieval plasterwork

Preventing the Undesired Surface Veiling after Nanolime Treatments on Wall Paintings: Preliminary Investigations

Consolidation tests in archaeological wall painting: comparing treatments depending on the painting technique

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