Analyzing the Laser-Light Reflection from Human Hair Fibers: Deriving a Measure of Hair Luster

    July 2004 in “ International Journal of Cosmetic Science ”
    Franz Wortmann, Erik Schulze zur Wiesche, B. Bourceau
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    TLDR The conclusion is that a new method to measure hair shine was confirmed to match people's visual assessments.
    The document presents a study on hair luster, focusing on the assessment of shine or luster as an important attribute of hair beauty. The study develops principles for assessing hair luster that align with practical situations and are based on the components of light reflected from single hair fibers, as measured by laser-based, multiangle goniophotometry. A gloss index is derived as a measure of hair luster from the ratio of integral intensities of specularly and diffusely reflected light components. The study analyzes changes in parameter values along the hair length, particularly their decrease, for hairs of different color and ethnic origin. The correlation between these measurements and shine evaluations of hair tresses by panels is examined and confirmed. The document does not provide specific numbers of participants or hair samples analyzed in the study.
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