A brush with the ancients / Holliday Pigments (Comines, France) in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 203, N° 4586 (07/2013)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 203, N° 4586 (07/2013) . - p. 13-14-19 Titre : A brush with the ancients Type de document : texte imprimé Auteurs : Holliday Pigments (Comines, France), Auteur Année de publication : 2013 Article en page(s) : p. 13-14-19 Langues : Anglais (eng) Catégories : Bleu outremer Le bleu outremer ou outremer est un bleu profond, longtemps extrait de la pierre fine de lapis-lazuli puis fabriqué synthétiquement à partir du XIXe siècle. La base est un thiosulfate d'aluminosilicate de sodium. Manganèse Pigments inorganiques Violet Index. décimale : 667.2 Colorants et pigments Résumé : From cave paintings of the 6th and 7th Centuries, through to the European Renaissance Period and beyond, we have evidence that artists have lOng cherished and employed natural ultramarine as a pigment. However, prohibitively rare and expensive as a raw material, it was always extremely difficult to extract the dazzling blue pigment, even when a relatively successful method was eventually discovered. Not until the 19th Century, when chemists cracked the problem of manufacturing ultramarine synthetically, did ultramarine blue reach the palettes of professional and amateur painters. Synthetic ultramarine now matches natural ultramtarine in terms of chemical composition, structure, hue and performance. Note de contenu : - A TORTUOUS PROCESS - SYNTHETIC SALVATION : Manganese violet - Oils - Acrylic - Water - Gouache - Alkyd - Pastels - Scholastics - Other products En ligne : https://drive.google.com/file/d/1oF-8Yz3y9D0UpLp1pEP8gwAlZEFC208P/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19203 [article]

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Fabric dyeing with colorimetric pH-responsive colours / Roberta Peila in COLORATION TECHNOLOGY, Vol. 137, N° 2 (04/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 2 (04/2021) . - p. 123-133 Titre : Fabric dyeing with colorimetric pH-responsive colours Type de document : texte imprimé Auteurs : Roberta Peila, Auteur ; Alessio Varesano, Auteur ; Claudia Vineis, Auteur ; Vittorio Bobba, Auteur ; Jacopo Bobba, Auteur ; Anne Piriou, Auteur ; Michele Barazzotto, Auteur Année de publication : 2021 Article en page(s) : p. 123-133 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acétate de cellulose L'acétate de cellulose est une matière plastique inventée en 1865. C'est l'ester acétate de la cellulose. Bleu (couleur) Colorants halochromiques Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Curcumine Evaluation Laine pH Polyacrylonitrile Polyamide 66 Rouge (couleur) Teinture -- Fibres textiles Violet Index. décimale : 667.3 Teinture et impression des tissus Résumé : This paper explores the possibility of dyeing textile fabrics with halochromic dyes. Five different halochromic dyes were tested: bromocresol purple, m-cresol purple, chlorophenol red, curcumin and bromothymol blue. Preliminary dyeing was carried out on wool, polyacrylonitrile, polyester, polyamide 6.6, cotton and cellulose acetate at 100°C for 40 minutes to evaluate affinity. All the dyes showed good affinity to wool and polyamide 6.6. Cotton required a mordant phase before dyeing. Washing and light fastness were evaluated for the dyed fabrics, as well as colour changes at different pH values. Some fibres displayed good dye fastness and halochromic properties. Bromothymol blue was selected to dye polyamide 6.6 and cotton fabrics. The dyed fabrics displayed good halochromic properties across a pH range of 4 to 10. Cotton fabrics exhibited an immediate colour change; polyamide 6.6 changed colour after several minutes. An industrial dyeing process was performed on natural cellulosic fibres. The results confirmed the possibility of scaling up the process with regard to textile applications of halochromic dyes. Note de contenu : - EXPERIMENTAL : Materials - Methods - Analysis - RESULTS AND DISCUSSION : Evaluation of the halochromic properties of the dyes - Multifibre textile fabric dyeing - Polyamide 6.6 textile fabric dyeing with bromothymol blue - Cotton gauze dyeing with bromothymol blue - Industrial dyeing with bromothymol blue dye DOI : https://doi.org/10.1111/cote.12511 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12511 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36072 [article]

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A method to improve the performance of wide dye concentration measurement based on the multi-pathlength spectrophotometry / Jianxin Zhang in COLORATION TECHNOLOGY, Vol. 139, N° 1 (02/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 1 (02/2023) . - p. 117-127 Titre : A method to improve the performance of wide dye concentration measurement based on the multi-pathlength spectrophotometry Type de document : texte imprimé Auteurs : Jianxin Zhang, Auteur ; Zhang Kangping, Auteur ; Huang Xuejiao, Auteur Année de publication : 2023 Article en page(s) : p. 117-127 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bains de teinture -- Analyse Bleu (couleur) Colorants Jaune Mesure Violet Index. décimale : 667.3 Teinture et impression des tissus Résumé : Accurate measurement of dye concentration in a dyebath is a basic step for dyeing process control and dyebath reuse. The dyebath usually covers a wide concentration range. In this article, a method based on multi-pathlength spectroscopy was proposed to improve the test performance for wide dye concentration. Partial least squares regression (PLSR) models were constructed on the combined pathlength spectra and evaluation metrics coefficient of determination (R2) and root mean square error (RMSE) were adopted for performance comparison. Results of the single-component experiment at different pathlengths (10, 5, 3, 2 and 1 mm) showed that for CI Acid Violet 54 and CI Acid Blue 113 the introduction of spectra at the 5 mm pathlength yielded greater performance. Further additions of lower pathlengths spectra were not as favourable as that of the 5 mm pathlength spectra for the models based on 10 mm spectra. While the upper concentration limits for three dyestuffs were raised to 0.50 g/L and 5 and 10 mm pathlengths were selected for further analysis, results demonstrated that the introduction of spectra at the 5 mm pathlength generally promoted the test performance for all three dyestuffs. Based on the results of single-component experiment, 10 and 5 mm pathlengths were eventually decided as the detection pathlengths for three-component solutions, and the concentration ranges of CI Acid Yellow 117, CI Acid Violet 54 and CI Acid Blue 113 were 0.03–0.48, 0.03–0.48 and 0.02–0.40 g/L, respectively. Results of three-component experiments suggested that evaluation metrics for the three dyestuffs were raised from 0.409, 0.409 and 0.980 to 0.957, 0.992 and 0.998, respectively, by the multi-pathlength spectroscopy technique. Note de contenu : MATERIALS AND METHODS : Dyestuffs - Instruments - Methods RESULTS AND DISCUSSION : Dye concentration measurement of single-component solutions - Dye concentration measurement of three-component mixed solutions - Table 1 : Abbreviations of combined pathlength - Table 2 : Test results for solutions of CI Acid Yellow 117 - Table 3 : Test results for solutions of CI Acid Violet 54 - Table 4 : Test results for solutions of CI Acid Blue 113 - Table 5 : Concentration levels of the three-component solutions - Table 6 : Test results for three-component solutions based on P2 DOI : https://doi.org/10.1111/cote.12640 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12640 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39210 [article]

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Purple reign / Dave Masterman in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 197, N° 4517 (10/2007)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 197, N° 4517 (10/2007) . - p. 32-34 Titre : Purple reign Type de document : texte imprimé Auteurs : Dave Masterman, Auteur Année de publication : 2007 Article en page(s) : p. 32-34 Langues : Anglais (eng) Catégories : Chromophores Formulation (Génie chimique) Manganèse Pigments inorganiques Réflectance Violet Index. décimale : 667.2 Colorants et pigments Résumé : This paper explain the background behind Holliday Pigments' new manganese violet grade. Manganese violet has long been used in cosmetics, where its vivid hues, stability and excellent safety in use are much appreciated ; it has all requisite FDA and European approvals. In addition, its manufacture is safe, with the minimal harmful by-products or toxic substances. However, until Holliday Pigments' innovative new grade, formulation difficulties have restricted the range of cosmetics in which it can be included. Managanese Violet (MnV) is a synthetic, inorganic pigment, which was first introduced around 1900. It is essentially a covalent combination of ammonia, manganese and phosphate. The standard chemical description is ammonium manganese pyrophosphate. The chromophore, which gives the pigment its bright violet colour is tri-valent manganese, which is stabilised within the compound structure by strong coordination with the phosphate and ammonia ions. Note de contenu : - Clean manufacture - Application processes - Desirable properties - International cosmetic approval - Other applications - Successfully over coming the limitation - Current legislation En ligne : https://drive.google.com/file/d/1SCxIwjQWP68JXYrvBNj08s9Fn2d2zYnO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27291 [article]

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