{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,24]],"date-time":"2026-01-24T14:04:34Z","timestamp":1769263474075,"version":"3.49.0"},"reference-count":70,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2020,5,10]],"date-time":"2020-05-10T00:00:00Z","timestamp":1589068800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100010198","name":"Ministerio de Econom\u00eda, Industria y Competitividad, Gobierno de Espa\u00f1a","doi-asserted-by":"publisher","award":["AERIMPACT (CGL2012-30729)"],"award-info":[{"award-number":["AERIMPACT (CGL2012-30729)"]}],"id":[{"id":"10.13039\/501100010198","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100010198","name":"Ministerio de Econom\u00eda, Industria y Competitividad, Gobierno de Espa\u00f1a","doi-asserted-by":"publisher","award":["EXPOAIR (P12-FQM-1889),"],"award-info":[{"award-number":["EXPOAIR (P12-FQM-1889),"]}],"id":[{"id":"10.13039\/501100010198","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100010198","name":"Ministerio de Econom\u00eda, Industria y Competitividad, Gobierno de Espa\u00f1a","doi-asserted-by":"publisher","award":["\u201cJuan de la Cierva-incorporaci\u00f3n\u201d (IJCI-2017-3277)"],"award-info":[{"award-number":["\u201cJuan de la Cierva-incorporaci\u00f3n\u201d (IJCI-2017-3277)"]}],"id":[{"id":"10.13039\/501100010198","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Minerals"],"abstract":"<jats:p>The behavior of historic tempera paints exposed to pollutant gases is an important issue when developing conservation strategies. In this work, binary tempera paint mock-ups that were made with either smalt or lapis lazuli pigments mixed with either rabbit glue or egg yolk binders were exposed to an SO2 accelerated aging test in order to find out more about the forms and mechanisms of alteration resulting from pigment-binder interaction. To this end, spectrophotometry, hyperspectral image analysis, and profilometry were used to study macro-scale, physical changes taking place on the surface of the paints, affecting color, gloss, reflectance, and roughness. Likewise, chemical and mineralogical changes were evaluated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (ATR-FTIR), polarized light microscopy (PLM), and scanning electron microscopy with micro-analysis (SEM-EDS), which was also used to visualize micro-texture changes in the paints. The smalt-based tempera showed a higher degree of deterioration than the lapis lazuli-based tempera, in particular a notable whitening related to the precipitation of sulfate-rich salts and to binder and pigment chemical alterations. Moreover, whereas aged egg yolk-based paints showed visible color change due to damage to the oily binder and the pigments, the most evident change in rabbit glue-based paints was binder loss. The alteration suffered by the pigments varied in line with their composition; thus, smalt (blue cobalt-containing glass) grains were more sensitive to SO2 exposure than lapis lazuli-(Na,Ca)8[(S,Cl,SO4,OH)2|(Al6Si6O24)]-crystals. In the smalt grains, the SO2 test caused K+ leaching from the glass matrix, which was detected by means of K\/Co ratios, but the lazurite crystals (main component of lapis lazuli) were unaffected (regardless of the binder used in the tempera). The most likely source of the crystallized sulfate rich salts were the impurities that were detected in association with the natural lapis lazuli pigment, i.e., calcite and diopside. Indeed, the precipitation of efflorescences is the main cause of the optical changes found in the smalt- and lapis lazuli-based tempera, in addition to the physical-chemical damage to the binders. The information reported here would be useful for preventive conservation, as well as for art restorers, who are planning work on paintings in which paints of this kind were used.<\/jats:p>","DOI":"10.3390\/min10050427","type":"journal-article","created":{"date-parts":[[2020,5,11]],"date-time":"2020-05-11T10:01:18Z","timestamp":1589191278000},"page":"427","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Effect of a SO2 Rich Atmosphere on Tempera Paint Mock-Ups. Part 1: Accelerated Aging of Smalt and Lapis Lazuli-Based Paints"],"prefix":"10.3390","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7536-9609","authenticated-orcid":false,"given":"Jos\u00e9 Santiago","family":"Pozo-Antonio","sequence":"first","affiliation":[{"name":"Dpto. de Enxe\u00f1ar\u00eda de Recursos Naturais e Medio Ambiente, Universidade de Enxe\u00f1ar\u00eda de Minas e Enerx\u00eda, Universidade de Vigo, 36310 Vigo, Spain"}]},{"given":"Teresa","family":"Rivas","sequence":"additional","affiliation":[{"name":"Dpto. de Enxe\u00f1ar\u00eda de Recursos Naturais e Medio Ambiente, Universidade de Enxe\u00f1ar\u00eda de Minas e Enerx\u00eda, Universidade de Vigo, 36310 Vigo, Spain"}]},{"given":"Amelia","family":"Dion\u00edsio","sequence":"additional","affiliation":[{"name":"CERENA, Instituto Superior T\u00e9cnico, Universidade de Lisboa. Av. Rovisco Pais, 1049-001 Lisboa, Portugal"}]},{"given":"Diana","family":"Barral","sequence":"additional","affiliation":[{"name":"Dpto. de Enxe\u00f1ar\u00eda de Recursos Naturais e Medio Ambiente, Universidade de Enxe\u00f1ar\u00eda de Minas e Enerx\u00eda, Universidade de Vigo, 36310 Vigo, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6771-0195","authenticated-orcid":false,"given":"Carolina","family":"Cardell","sequence":"additional","affiliation":[{"name":"Department of Mineralogy and Petrology, Faculty of Science, University of Granada, 18071 Granada, Spain"}]}],"member":"1968","published-online":{"date-parts":[[2020,5,10]]},"reference":[{"key":"ref_1","unstructured":"European Environment Agency (2013). Air Pollution Fact Sheet 2013\u2014Spain, European Environment Agency."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"7484","DOI":"10.1021\/ac0612224","article-title":"Blackening of Pompeian Cinnabar Paintings: X-ray Microspectroscopy Analysis","volume":"78","author":"Cotte","year":"2006","journal-title":"Anal. Chem."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"3319","DOI":"10.1021\/ac1029192","article-title":"Thermodynamic and spectroscopic speciation to explain the blackening process of hematite formed by atmospheric SO2 impact: The case of Marcus Lucretius House (Pompeii)","volume":"83","author":"Maguregui","year":"2011","journal-title":"Anal. Chem."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"564","DOI":"10.1016\/j.scitotenv.2011.11.028","article-title":"Black soiling of an architectural limestone during two-year term exposure to urban air in the city of Granada (S Spain)","volume":"414","author":"Urosevic","year":"2012","journal-title":"Sci. Total Environ."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"49","DOI":"10.1016\/0048-9697(95)04568-L","article-title":"Contribution of atmospheric deposition to the formation of damage layers","volume":"167","author":"Sabbioni","year":"1995","journal-title":"Sci. Total Environ."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"175","DOI":"10.1016\/j.scitotenv.2005.01.009","article-title":"Aesthetic thresholds and blackening of stone buildings","volume":"349","author":"Brimblecombe","year":"2005","journal-title":"Sci. Total Environ."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"137","DOI":"10.1016\/j.scitotenv.2014.02.128","article-title":"Sulphur and oxygen isotope analysis to identify sources of sulphur in gypsum-rich black crusts developed on granites","volume":"482","author":"Rivas","year":"2014","journal-title":"Sci. Total Environ."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"393","DOI":"10.1144\/GSL.SP.2002.205.01.28","article-title":"Acid deposition and the deterioration of stone: A brief review of a broad topic","volume":"205","author":"Charola","year":"2002","journal-title":"Geol. Soc. Spec. Pub."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"187","DOI":"10.1016\/j.aca.2004.10.065","article-title":"Black crusts and patinas on Pentelic marble from the Parthenon and Erechtheum (Acropolis, Athens): Characterization and origin","volume":"532","year":"2005","journal-title":"Anal. Chim. Acta"},{"key":"ref_10","first-page":"297","article-title":"The Oceanus statue of the Fontana di Trevi (Rome): The analysis of black crust as a tool to investigate the urban air pollution and its impact on the stone degradation","volume":"593\u2013594","author":"Fermo","year":"2017","journal-title":"Sci. Total Environ."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"99","DOI":"10.1016\/j.porgcoat.2018.06.017","article-title":"Effect of proteinaceous binder on pollution-induced sulfation of lime-based tempera paints","volume":"123","author":"Herrera","year":"2018","journal-title":"Prog. Org. Coat."},{"key":"ref_12","unstructured":"Mayer, R. (1985). Materiales y T\u00e9cnicas del Arte, Hermann Blume."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"161","DOI":"10.1179\/sic.2006.51.3.161","article-title":"Pigment and Plasterwork Analyses of Nasrid Polychromed Lacework Stucco in the Alhambra (Granada, Spain)","volume":"51","year":"2006","journal-title":"Stud. Conserv."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"637","DOI":"10.1111\/j.1475-4754.2008.00438.x","article-title":"Analysis of Nasrid polychrome carpentry at the Hall of the Mexuar Palace, Alhambra complex (Granada, Spain), combining microscopic, chromatographic and spectroscopic methods","volume":"51","author":"Cardell","year":"2009","journal-title":"Archaeometry"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"108349","DOI":"10.1016\/j.dyepig.2020.108349","article-title":"Natural or synthetic? Simultaneous Raman\/luminescence hyperspectral microimaging for the fast distinction of ultramarine pigments","volume":"178","author":"Arjonilla","year":"2020","journal-title":"Dye. Pigment."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"1006","DOI":"10.1002\/jrs.4439","article-title":"Decorated plasterwork in the Alhambra investigated by Raman spectroscopy: Comparative field and laboratory study","volume":"45","year":"2014","journal-title":"J. Raman Spectrosc."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"5763","DOI":"10.1039\/c2an36027f","article-title":"In situ noninvasive Raman microspectroscopic investigation of polychrome plasterworks in the Alhambra","volume":"137","year":"2012","journal-title":"Analyst"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"109805","DOI":"10.1016\/j.jfoodeng.2019.109805","article-title":"Subcritical fluid extraction treatment on egg yolk: Product characterization","volume":"274","author":"Su","year":"2020","journal-title":"J. Food Eng."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"55","DOI":"10.1179\/sic.2007.52.Supplement-1.55","article-title":"Animal glues: A review of their key properties relevant to conservation","volume":"8","author":"Schellmann","year":"2007","journal-title":"Rev. Conserv. Stud."},{"key":"ref_20","unstructured":"Palet, A. (2002). Tratado de Pintura: Color, Pigmentos y Ensayo, Edicions Universitat de Barcelona (UB)."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"298","DOI":"10.1016\/j.measurement.2017.06.037","article-title":"Statistical analysis of colour changes in tempera paints mock-ups exposed to urban and marine environment","volume":"118","author":"Rivas","year":"2018","journal-title":"Measurement"},{"key":"ref_22","first-page":"56","article-title":"Effect of tempera paint composition on their superficial physical properties- application of interferometric profilometry and hyperspectral imaging techniques","volume":"117C","author":"Barral","year":"2018","journal-title":"Prog. Org. Coat."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"53","DOI":"10.1016\/j.dyepig.2017.02.001","article-title":"Pigment-size effect on the physico-chemical behavior of azurite-tempera dosimeters upon natural and accelerated photo aging","volume":"141","author":"Cardell","year":"2017","journal-title":"Dye. Pigment."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"236","DOI":"10.1016\/j.saa.2019.03.027","article-title":"Weathering behavior of cinnabar-based tempera paints upon natural and accelerated aging","volume":"226","author":"Elert","year":"2019","journal-title":"Spectrochim. Acta Part A Mol. Biomol. Spectrosc."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"281","DOI":"10.1162\/002409400552667","article-title":"A renaissance of color: Particle separation and preparation of azurite for use in oil painting","volume":"33","author":"Price","year":"2000","journal-title":"Leonardo"},{"key":"ref_26","unstructured":"P\u00e9rez, M., Castro, K., Rodr\u00edguez, M.D., Olazabal, M.A., and Madariaga, J.M. (2002). A critical analysis of commercial pigments. ART 2002, Proceedings of the 7th International Conference on Non-destructive Testing and Microanalysis for the Diagnostics and Conservation of the Cultural and Environmental Heritage, 2\u20136 June 2002, Antwerp, Belgium, University of Antwerp."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"236","DOI":"10.1016\/j.dyepig.2017.09.013","article-title":"Pigment-binder interactions in calcium-based tempera paints","volume":"148","author":"Elert","year":"2018","journal-title":"Dye. Pigment."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"21","DOI":"10.1016\/S0304-3894(98)00241-6","article-title":"Corrosive effects from the deposition of gaseous pollutants on surfaces of cultural and artistic value inside museums","volume":"64","author":"Katsanos","year":"1999","journal-title":"J. Hazard. Mater."},{"key":"ref_29","first-page":"35","article-title":"Dosimetry of paintings: Determination of the degree of chemical change in museum exposed test paintings (smalt tempera) by thermal analysis","volume":"365","author":"Odlyha","year":"2000","journal-title":"Acta"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"260","DOI":"10.1016\/j.vibspec.2010.04.003","article-title":"A study of the interaction between rabbit glue binder and blue copper pigment under UV radiation: A spectroscopic and PCA approach","volume":"53","author":"Manzano","year":"2010","journal-title":"Vib. Spectrosc."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"2859","DOI":"10.1021\/es991437d","article-title":"Tempera-painted dosimeters for environmental indoor monitoring: A spectroscopic and chemometric approach","volume":"34","author":"Bacci","year":"2000","journal-title":"Environ. Sci. Technol."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"701","DOI":"10.1007\/s00339-009-5163-9","article-title":"A study of smalt and red lead discolouration in Antiphonitis wall paintings in Cyprus","volume":"96","author":"Daniilia","year":"2009","journal-title":"Appl Phys. A"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"53","DOI":"10.1016\/j.talanta.2016.04.006","article-title":"An evaluation of the impact of urban air pollution on paint dosimeters by tracking changes in the lipid MALDI-TOF mass spectra profile","volume":"155","author":"Herrera","year":"2016","journal-title":"Talanta"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"113","DOI":"10.1016\/j.chemolab.2017.05.007","article-title":"Principal Component Analysis to interpret changes in chromatic parameters on paint dosimeters exposed long-term to urban air","volume":"167","author":"Herrera","year":"2017","journal-title":"Chemom. Intell. Lab. Syst."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"274","DOI":"10.1016\/j.cemconcomp.2018.12.005","article-title":"Effect of animal glue on mineralogy, strength and weathering resistance of calcium sulfate-based composite materials","volume":"96","author":"Elert","year":"2019","journal-title":"Cem. Concr. Compos."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"235","DOI":"10.1016\/j.corsci.2018.05.005","article-title":"Blue enamel pigment\u2014Chemical and morphological characterization of its corrosion process","volume":"139","author":"Machado","year":"2018","journal-title":"Corros. Sci."},{"key":"ref_37","unstructured":"Gettens, R., and Stout, G. (1966). Painting Materials: A Short Encyclopedia, Dover Publications."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"445","DOI":"10.1016\/j.optlastec.2005.06.005","article-title":"Colour and art: A brief history of pigments","volume":"38","author":"Barnett","year":"2006","journal-title":"Opt. Laser Technol."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"297","DOI":"10.3406\/crai.2009.92472","article-title":"Aux origines des bleus de cobalt: Les d\u00e9buts de la fabrication du saffre et du smalt en Europe Occidentale","volume":"153-1","author":"Delamare","year":"2009","journal-title":"Comptes Rendus Seances Acad. Inscr. Belles Lett"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"952","DOI":"10.2533\/chimia.2001.952","article-title":"Imaging microspectroscopic, secondary ion mass spectrometric and electron microscopic studies on discoloured and partially discoloured smalt in cross- sections of 16th century paintings","volume":"55","author":"Boon","year":"2001","journal-title":"Chim. Int. J. Chem."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"4628","DOI":"10.1039\/c3ay40906f","article-title":"Vibrational spectroscopy correlated with elemental analysis for the investigation of smalt pigment and its alteration in paintings","volume":"5","author":"Robinet","year":"2013","journal-title":"Anal. Methods"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"5145","DOI":"10.1021\/ac200184f","article-title":"Investigation of the discoloration of smalt pigment in historic paintings by micro-X-ray absorption spectroscopy at the Co K-edge","volume":"83","author":"Robinet","year":"2011","journal-title":"Anal. Chem."},{"key":"ref_43","first-page":"56","article-title":"Investigation of pigment-medium processes in oil paint containing degraded smalt","volume":"26","author":"Spring","year":"2005","journal-title":"Natl. Gallery Tech. Bull."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"29","DOI":"10.1179\/sic.2006.51.1.29","article-title":"A Study of Smalt and its Conservation Problems in Two Sixteenth-Century Wall Paintings in Rome","volume":"51","author":"Santopadre","year":"2006","journal-title":"Stud. Conserv."},{"key":"ref_45","unstructured":"Eastaugh, N., Walsh, V., Chaplin, T., and Siddall, R. (2004). Pigment Compendium. A Dictionary of Historical Pigments, Butterworth-Heineman."},{"key":"ref_46","first-page":"434","article-title":"Vibrational spectroscopy and SEM-EDX analysis of wall painted surfaces, Orchha Fort, India","volume":"24","year":"2019","journal-title":"J. Archaeol. Sci. Rep."},{"key":"ref_47","unstructured":"Pacheco, F. (1990). El Arte de la Pintura, C\u00e1tedra."},{"key":"ref_48","unstructured":"European Environment Agency (2020, January 15). Sulphur Dioxide (SO2): Annual Mean Concentrations in Europe. Available online: http:\/\/www.eea.europa.eu\/themes\/air\/interactive\/so2."},{"key":"ref_49","unstructured":"Commission Internationale de l\u2019Eclairage (1986). Colorimetry, CIE Central Bureau. CIE Publication 15\u20132."},{"key":"ref_50","unstructured":"Commission Internationale de l\u2019Eclairage (2007). Colorimetry Part 4: CIE 1976 L*a*b* Colour Space, CIE Central Bureau. CIE S014-4\/E."},{"key":"ref_51","first-page":"383","article-title":"Color difference DeltaE-A survey","volume":"20","author":"Mokrzycki","year":"2011","journal-title":"Mach. Graph. Vis."},{"key":"ref_52","unstructured":"International Organization for Standardization (1999). UNE-EN ISO 4288, Geometrical Product Specifications (GPS). Surface Texture: Profile Method, Terms, Definitions and Surface Texture Parameters, ISO."},{"key":"ref_53","unstructured":"International Organization for Standardization (2013). BS EN 828-Adhesives. Wettability. Determination by Measurement of Contact Angle and Surface Free Energy of Solid Surface, ISO."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"56","DOI":"10.1016\/j.chemgeo.2012.11.014","article-title":"Do carbonate precipitates affect dissolution kinetics?: 2: Diopside","volume":"337","author":"Stockmann","year":"2013","journal-title":"Chem. Geol."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"139","DOI":"10.1016\/j.nimb.2013.06.063","article-title":"Characterization of the lapis lazuli from the Egyptian Treasure of Tod and its Alteration using external u-PIXE and u-IBIL","volume":"318","author":"Calligaro","year":"2014","journal-title":"Nucl. Instrum. Methods Phys. Res. Sect. B Beam Interact. Mater. At."},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"121","DOI":"10.1016\/j.gca.2012.12.045","article-title":"Linking nm-scale measurements of the anisotropy of silicate surface reactivity to macroscopic dissolution rate laws: New insights based on diopside","volume":"107","author":"Daval","year":"2013","journal-title":"Geochim. Et Cosmochim. Acta"},{"key":"ref_57","unstructured":"Edelstein, S. (2013). Food Science. An Ecological Approach, Jones and Bartlett Learning. [2nd ed.]."},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"7","DOI":"10.1186\/s40494-019-0249-y","article-title":"Non-invasive identification of paint binders in illuminated manuscripts by ER-FTIR spectroscopy: A systematic study of the influence of different pigments on the binders\u2019 characteristic spectral features","volume":"7","author":"Nodari","year":"2019","journal-title":"Herit. Sci."},{"key":"ref_59","doi-asserted-by":"crossref","first-page":"65","DOI":"10.1007\/s00216-008-2126-5","article-title":"Attenuated total reflection micro FTIR characterization of pigment-binder interaction in reconstructed paint flims","volume":"392","author":"Mazzeo","year":"2008","journal-title":"Anal. Bioanal. Chem."},{"key":"ref_60","doi-asserted-by":"crossref","first-page":"217","DOI":"10.1016\/j.vibspec.2005.02.011","article-title":"Infrared imaging of compositional changes in inflammatory cardiomyopathy","volume":"38","author":"Wang","year":"2005","journal-title":"Vib. Spectrosc."},{"key":"ref_61","doi-asserted-by":"crossref","first-page":"141","DOI":"10.1016\/j.aca.2008.10.008","article-title":"Benefits of applying combined diffuse reflectance FTIR spectroscopy and principal component analysis for the study of blue tempera historical painting","volume":"630","author":"Navas","year":"2008","journal-title":"Anal. Chim. Acta"},{"key":"ref_62","doi-asserted-by":"crossref","first-page":"31","DOI":"10.1016\/j.microc.2015.07.018","article-title":"Fourier transform infrared spectroscopic study of rabbit glue\/inorganic pigments mixtures in fresh and aged reference paint reconstructions","volume":"124","author":"Pellegrini","year":"2016","journal-title":"Microchem. J."},{"key":"ref_63","doi-asserted-by":"crossref","first-page":"15","DOI":"10.1016\/S0924-2031(98)00096-4","article-title":"Spectrochemical characterization by micro-FTIR spectroscopy of blue pigments in different polychrome works of art","volume":"20","author":"Bruni","year":"1999","journal-title":"Vib. Spectrosc."},{"key":"ref_64","doi-asserted-by":"crossref","first-page":"1094","DOI":"10.1515\/zna-1992-1015","article-title":"On some Crystals of \u201cLapis Lazuli\u201d","volume":"47","author":"Banerjee","year":"1992","journal-title":"Z. Naturforsch."},{"key":"ref_65","unstructured":"Derrick, M.R., Stulik, D., and Landry, J.A. (1999). Infrared Spectrosocpy in Conservation Science. Scientific Tools for Conservations, The Getty Conservation Institute."},{"key":"ref_66","doi-asserted-by":"crossref","unstructured":"La Russa, M.F., Ruffolo, S.A., Barone, G., Crisci, G.M., Mazzoleni, P., and Pezzino, A. (2009). The Use of FTIR and Micro-FTIR Spectroscopy: An Example of Application to Cultural Heritage. Int. J. Spectrosc.","DOI":"10.1155\/2009\/893528"},{"key":"ref_67","doi-asserted-by":"crossref","first-page":"43","DOI":"10.1016\/j.polymdegradstab.2017.08.002","article-title":"Photo-catalytic degradation of binding media of ultramarine blue containing paint layers: A new perspective on the phenomenon of \u201cultramarine disease\u201d in painting","volume":"144","author":"Michelin","year":"2017","journal-title":"Polym. Degrad. Stab."},{"key":"ref_68","doi-asserted-by":"crossref","first-page":"8209","DOI":"10.1021\/la048629t","article-title":"Mimicking the Lotus Effect: Influence of Double Roughness Structures and Slender Pillars","volume":"20","author":"Patankar","year":"2004","journal-title":"Langmuir"},{"key":"ref_69","doi-asserted-by":"crossref","first-page":"1857","DOI":"10.1002\/adma.200290020","article-title":"Super-Hydrophobic Surfaces: From Natural to Artificial","volume":"14","author":"Feng","year":"2002","journal-title":"Adv. Mater."},{"key":"ref_70","doi-asserted-by":"crossref","first-page":"7326","DOI":"10.1021\/ie200343k","article-title":"Preparation of acid-resisting ultramarine blue by novel two-step silica coating process","volume":"50","author":"Li","year":"2011","journal-title":"Ind. Eng. Chem. Res."}],"container-title":["Minerals"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2075-163X\/10\/5\/427\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T09:27:24Z","timestamp":1760174844000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2075-163X\/10\/5\/427"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,5,10]]},"references-count":70,"journal-issue":{"issue":"5","published-online":{"date-parts":[[2020,5]]}},"alternative-id":["min10050427"],"URL":"https:\/\/doi.org\/10.3390\/min10050427","relation":{},"ISSN":["2075-163X"],"issn-type":[{"value":"2075-163X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2020,5,10]]}}}