Development and application of a mathematical model to explain fading rate inconsistencies observed in light-sensitive materials / Marion F. Mecklenburg in COLORATION TECHNOLOGY, Vol. 128, N° 2 (2012)  

[article]  inCOLORATION TECHNOLOGY > Vol. 128, N° 2 (2012) . - p. 139-146 Titre : Development and application of a mathematical model to explain fading rate inconsistencies observed in light-sensitive materials Type de document : texte imprimé Auteurs : Marion F. Mecklenburg, Auteur ; Julio M. del Hoyo-Meléndez, Auteur Année de publication : 2012 Article en page(s) : p. 139-146 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Décoloration Modèles mathématiques Photostabilité Teinture -- Fibres textiles Textiles et tissus Index. décimale : 667.3 Teinture et impression des tissus Résumé : Light fastness tests conducted on several areas of a light-sensitive material may sometimes show inconsistent fading rates. These different fading behaviours suggest that colorants are not evenly distributed over the substrate surface or may be attributed to texture variations of the material. A mathematical model has been developed to help explain these discrepancies. Micro-fade testing, a relatively novel technique, has allowed microspectroscopic detection of variations in the initial colour parameters of a sample, permitting assessment of its diverging fading rates. The method has been applied to fading data of various light-sensitive materials resulting in more consistent fading patterns. It has been demonstrated that micro-fading curves obtained for the same material are related by a constant value, which is the ratio of adjusted values of time and ΔE*. Note de contenu : - EXPERIMENTAL : Materials - Light fastness measurements - Theoretical model - RESULTS AND DISCUSSION : Application of the mathematical model to the normalisation of fading data - Blue wool 1 standard trials - Bengal rose gouache data - Silk sample dyed with turmeric DOI : 10.1111/j.1478-4408.2012.00359.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2012.00359.x/pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14895 [article]

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Measuring photostability through glass : the application of microfading testing to the study of framed pastel artworks / Julio M. del Hoyo-Meléndez in COLORATION TECHNOLOGY, Vol. 134, N° 6 (12/2018)  

[article]  inCOLORATION TECHNOLOGY > Vol. 134, N° 6 (12/2018) . - p. 412-422 Titre : Measuring photostability through glass : the application of microfading testing to the study of framed pastel artworks Type de document : texte imprimé Auteurs : Julio M. del Hoyo-Meléndez, Auteur ; Pawel Swit, Auteur ; Joanna Sobczyk, Auteur Année de publication : 2018 Article en page(s) : p. 412-422 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Mesure Objets d'art -- Conservation et restauration Oeuvres -- Peintures Photostabilité Index. décimale : 746.6 Impression, peinture, teinture Résumé : Paper-based heritage objects on exhibition are typically framed using a transparent glazing material such as glass or acrylic. This often makes the task of measuring their light fastness a difficult one since cultural institutions may have unframing restrictions, especially for large-format objects. However, a testing programme recently conducted at the National Museum in Krakow has revealed that in certain cases it is possible to obtain colorant stability information directly from a framed object. Microfading testing results are reliable if the distance from the object to the protective glazing is adequate to allow proper illumination and collection of reflected light. This paper presents a case study of six large-format pastels on paper by Stanisław Wyspiański, one of the most outstanding and versatile artists at the turn of the twentieth century in Poland. Some of the orange and pink areas showed higher sensitivity to light with fading rates that remain within the Blue Wool 1-2 range. The objects have been classified according to the light sensibility of their colorants, and this information has allowed development and implementation of exhibition guidelines that serve to minimise the degradation associated with museum illumination. In addition, scientific imaging, microfading data and computer analysis of the images have allowed virtual representation of the potential colour changes that these artworks may experience as a result of uncontrolled and long exposure to gallery illumination. Note de contenu : - MATERIALS AND METHODS : Pastel paintings - Microfading testing - Evaluation of MFT data - Mathematical treatment of MFT data - Light damage calculations - conversion of CIE L*a*b* data to RGB - Imaging and colour change simulation - Preventive conservation strategy - RESULTS AND DISCUSSION : Preliminary measurements through a microscope slide using reference materials - Analysis of the pastel painting Polonia - Virtual representation of potential colour changes - Preventive conservation measures DOI : 10.1111/cote.12365 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12365 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31366 [article]

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