Studies of Light Scattering from Ethnic Hair Fibers

The document includes a study that aimed to differentiate between specular and diffuse reflectance in hair fibers from European, African, and Asian ethnic groups. The study analyzed goniophotometric curves of light reflected from unaltered single hair fibers and found that the broadening of the specular peak reduces luster values, which is related to hair fiber characteristics such as diameter, cross-sectional shape, and curvature. A new method for evaluating hair luster from these curves was proposed, and a general model for light scattering was presented, showing how surface roughness and internal scattering and absorption processes affect the specular reflectance peak and its broadening.