Study on Visual Texture and Optical Properties of Make-Up Cosmetics Containing Pearlescent Pigments.

概要

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For the purpose of measuring the pearlescence, basic optical theory was applied to develop a new evaluation procedure which can separate the pearlescent pigments's original interference light from the sample's surface gloss. The measurement is based on the Frenel's equation, which represents the disappearance of the P-polarized component of the surface reflection light under the Brewster angle incident condition. Therefore, by measuring the reflection of the P-polarized and S-polarized light respectively, it becomes possible to obtain information of the reflection light of pearlescent pigments, separately from the surface gloss and the object color. This method was found to be extremely useful for films, lipstick's appearance, or any other object containing pearlescent pigments. Moreover, the results of this evaluation show that the pealescence is influenced by the particle sizes of pearlescent pigments, the optical properties of coexisting colorants, and the surface smoothness of the sample.
日本化粧品技術者会の論文