[article]
| Titre : |
The diversity of the human hair colour assessed by visual scales and instrumental measurements. A worldwide survey |
| Type de document : |
texte imprimé |
| Auteurs : |
Isabelle Lozano, Auteur ; J. B. Saunier, Auteur ; S. Panhard, Auteur ; G. Loussouarn, Auteur |
| Année de publication : |
2017 |
| Article en page(s) : |
p. 101-107 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Analyse spectrale
Cheveux -- analyse
Colorimétrie
Pigmentation des cheveux
|
| Index. décimale : |
668.5 Parfums et cosmétiques |
| Résumé : |
Objectives : To study (i) the diversity of the natural colour of the human hair through both visual assessment of hair tone levels and colorimetric measurements of hair strands collected from 2057 human male and female volunteers, from 23 regions of the world and (ii) the correlation between visual assessments and colorimetric measurements.
Methods : Hair strands were analysed by a spectrocolorimeter under the L*, a*, b* referential system and scored in vivo by experts before sampling, through standardized visual reference scales based on a 1–10 range.
Results : Results show that from a typological aspect, black or dark brown hairs largely predominate among studied ethnic groups, whereas Caucasian or derived populations exhibit the widest palette of medium to fair shades, partly explaining some past interbreeding among populations. Instrumental measurements clearly confirm that a given colour of a pigmented hair, at the exclusion of red hairs, is mostly governed by two components, L* and b*, from the L*, a*, b* reference system.
Conclusion : The comparisons between visual assessments and instrumental data show that these appear closely linked. Darker hairs show close or subtle variations in L*, a*, b* parameters, making their individual colour differentiation calling for technical improvements in colorimetric measurements. The latter are likely governed by other physical factors such as shape, diameter and shine. |
| Note de contenu : |
- MATERIALS AND METHODS : Subjects - Hair sampling - Visual assessments - Colorimetric measurements - Statistics
- RESULTS : Overall analysis through L*, a*, b* axis - Pigmented hairs (non-red, non-white) - Links between instrumental measurements and visual assessments - Pigmented hairs and geographical regions - The case of red hairs - The case of grey hairs |
| DOI : |
10.1111/ics.12359 |
| En ligne : |
https://drive.google.com/file/d/14reAZ0LwAy-UVulJwPj_a2YASTVOECxx/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27849 |
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 39, N° 1 (02/2017) . - p. 101-107
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