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Analyzing the laser-light reflection from human hair fibers. II. Deriving a measure of hair luster

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Hair shine or luster is perceived as an important, though analytically somewhat elusive, attribute of beauty, primarily associated with clean and healthy hair. Principles for the assessment of hair luster are developed that are consistent with the practical situation. These principles are related to the components of light, specularly and diffusely reflected from single hair fibers, as measured by laser-based, multiangle goniophotometry, presented in Part I. Considering various definitions of gloss, their tradition, practical implementation, and their inherent limitations for testing hair, the gloss index as a physically consistent measure of hair luster is derived from the ratio of the integral intensities of the light components. Changes of the parameter values along hair length, namely their decrease, are analyzed for hairs of different color and ethnic origin. The correlation with shine evaluations of hair tresses by panels, based on literature data, is analyzed and ascertained.
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Document Type: Abstract

Affiliations: 1: DWI, German Wool Research Institute, Veltmanplatz 8, 52062 Aachen, Germany 2: Schwarzkopf GmbH, Hohenzollernring 127-129, 22763 Hamburg, Germany 3: Fiantec GmbH, Technologiezentrum, Europaplatz, 52068 Aachen, Germany

Publication date: August 1, 2004

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