In situ evaluation by colour spectrophotometry of cleaning and protective treatments in granitic Cultural Heritage

Pozo-António, J.S.; Montojo, C.; Silanes, M.E. López de; Rosario, Iván de; Rivas, T.

doi:10.1016/j.ibiod.2017.07.004

Cited by 24 publications

(17 citation statements)

References 31 publications

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“…The cleaning effect of the treatments was assessed immediately after treatment, and after one and two weeks, by color spectrophotometry, a reliable tool to evaluate the presence and vitality of phototrophs [30][31][32][33][34][35] and the cleaning effectiveness in granite [8,24].…”

Section: Evaluation Of Cleaning Effectiveness By Using Color Spectropmentioning

confidence: 99%

“…Monitorization for 14 days was carried out in order to evaluate the effectiveness and persistence of each treatment over time in terms of cleaning, and to evaluate the change of color of the substrate over time. The data were analyzed using the CIELAB color system [37], where of the three parameters (L*, a* and b*) that define it, only the chromatic parameters, i.e., a* (associated with changes in redness-greenness) and b* (associated with changes in yellowness-blueness) proved relevant for evaluating the efficacy of the treatments, as in Sanmartín et al [8,24]. Thus, partial differences in these parameters were determined using the following equations:…”

Section: Evaluation Of Cleaning Effectiveness By Using Color Spectropmentioning

confidence: 99%

“…Furthermore, in the case of poultices with quaternary ammonium-based compounds (QACs), chemicals are largely employed in different fields because of their wide action for cleaning purposes (since, besides being antimicrobial agents, secondarily are used as surfactants) [8][9][10]. They can promote (as main side-effect) the recolonization of the surfaces by phototropic and heterotrophic microorganisms able to use the organic residuals of the QACs as carbon and nitrogen sources [1,11].…”

Section: Introductionmentioning

confidence: 99%

“…In the context of this article, these treatments denote the cleaning effectiveness, i.e., removal of biofouling from granite surface, only removal not considering the microbial abatement related to biocide effect of treatment, intended to destroy, deter, or exert a controlling effect on organisms by chemical or biological means. In this sense, color spectrophotometry, the technique used in the study, allows to reliably evaluate the cleaning effectiveness in granite [3,8].…”

Section: Introductionmentioning

confidence: 99%

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Phytochemical Compounds as Cleaning Agents on Granite Colonized by Phototrophic Subaerial Biofilms

et al. 2020

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The society has become increasingly interested in using natural products over chemicals for cleaning activities. In this study, the cleaning potential of formulations embedded in a hydrogel matrix and composed respectively of essential oils (EOs) of Origanum vulgare, Thymus vulgaris, and Calamintha nepeta, and their respective main active components (EO-ACs), viz., Carvacrol, Thymol, and Pulegone, on a phototropic biofilm growing on granite was investigated. In addition, and for comparative purposes, analysis with the combination of the three EOs, the combination of the three EO-ACs, and Preventol RI-80® (one of the most effective commercial cleaning agents based on quaternary ammonium salts) in all three cases embedded in a hydrogel matrix, as well as only the hydrogel matrix, distilled water, and Preventol RI-80®, in both latter cases applied with brush, were also studied. The cleaning effect of the treatments was assessed immediately after the treatment and after one and two weeks by color spectrophotometry, a reliable tool to evaluate the presence and vitality of the phototrophs and the cleaning effectiveness in granite. C. nepeta and its active component Pulegone proved to be the most effective and yielded similar results, comparable to those of uncolonized granite, and better than those obtained with Preventol RI-80® applied with brush (most common way), especially at the end of the experiment. These promising first results support the suitable use of the phytochemical compounds used on phototrophs field where there are still few published studies and encourage further investigation toward the evaluation of their exhibited biocidal activity.

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Section: Evaluation Of Cleaning Effectiveness By Using Color Spectropmentioning

confidence: 99%

Section: Evaluation Of Cleaning Effectiveness By Using Color Spectropmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phytochemical Compounds as Cleaning Agents on Granite Colonized by Phototrophic Subaerial Biofilms

et al. 2020

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“…Our proposed scheme for the removal of such complex contaminations will be used for restoration of the exhibits of the Pushkin State Museum of Fine Arts with similar contaminations. This approach can compete with other forms of marble treatment in conservation practice especially for the cases of complex surface pollutants as such as [37][38][39]. Fig.…”

Section: Discussionmentioning

confidence: 99%

Research of a complex fire-induced pollution on the marble relief from the Pushkin state museum of fine arts collection

et al. 2019

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Background: Fundamental restoration of sculptures must include the research of pollution composition and exhibit surface condition as well as accurate identification of the materials of sculptures, bas-reliefs and coatings. In the recent years, studies of marble objects aimed at identification of contamination nature and composition have been developed. It should be noted that some exhibits have individual features as objects of restoration due to complex exposure to the environment, e.g. to fire. Results: The article describes the results of surface contamination study on two exhibits from the Pushkin State Museum of Fine Arts collection. Marble relief sculpture "The Flagellation of Christ" was the main object of the study. Glazed terracotta (majolica) "Madonna Friedrichshain" was studied as a control sample with the same type of contaminations but with less sensitive surface. According to the results of different gas chromatography and X-ray fluorescence analyses, pollution compounds were identified as fatty alcohols, fatty acids and esters, part of which being residues of pyrolysis gasification, including those containing iron and lead. In order to gently clean the exhibits, several variants of chemical compounds were proposed based on various chelating agent mixtures, and, after studying their comparative effectiveness, the optimal scheme was chosen for removing existing contamination. For verification of marble exhibits safety, selected cleaning mixtures were tested on polished Carrara marble sample. Conclusion: The most suitable scheme of organic contaminations removal including those containing iron and lead was suggested as part of restoration process. There is a number of working schemes of cleaning the surface of exhibits, however our proposed scheme interacts with the marble surface more gently because the target cleaning mixture composition was formulated taking into account the nature of pollutants and the least possible impact on the sample surface.

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Effect of UV radiation on chromatic parameters in serpentinites used as dimension stones

Navarro

Catarino

Pereira

et al. 2019

Bull Eng Geol Environ

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Colour is an important parameter that must be taken into account if aesthetic homogeneity in both construction and restoration work is to be achieved. In serpentinites, the different degrees of serpentinization or carbonation can influence their final colour. Sunlight, especially ultraviolet (UV) radiation, is a common agent that can decay properties such as hue, lightness, and chroma, and can have a very significant effect on the ageing process of dimension stones. Testing the effects of UV radiation is fundamental for predicting how materials may behave upon exposure. In this work, the surface alteration of materials due to UV radiation by means of arc-xenon lamps was carried out to determine the degree of variation in colour parameters in serpentinites used as dimension stones. It was observed that the effect of UV radiation

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In situ evaluation by colour spectrophotometry of cleaning and protective treatments in granitic Cultural Heritage

Cited by 24 publications

References 31 publications

Phytochemical Compounds as Cleaning Agents on Granite Colonized by Phototrophic Subaerial Biofilms

Phytochemical Compounds as Cleaning Agents on Granite Colonized by Phototrophic Subaerial Biofilms

Research of a complex fire-induced pollution on the marble relief from the Pushkin state museum of fine arts collection

Effect of UV radiation on chromatic parameters in serpentinites used as dimension stones

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