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KMID : 0604520100360040253
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Journal of the Society of Cosmetic Scientists of Korea
2010 Volume.36 No. 4 p.253 ~ p.258
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Evaluating the Efficacy of Whitening Products by Using Luminescence Measurement and Revealing Correlation between Luminescence and Other Parameters
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Jeong Choon-Bok
Kim Han-Kon
Nam Kae-Won
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Abstract
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Until now, evaluating the efficacy of brightening mainly depends on total reflective light measurement. For example, SHV (Saturation, Hue, Value), (CIELAB color space system) color space system was used and lightness and saturation changes were chosen as major parameters for evaluating brightening effect. However, those parameters were calculated from total reflective light on the skin and it is hard to evaluate perceptive efficacy such as luminescence, and glossy. In this research, we applied new method for estimating change of luminescence of skin by using ’Lumiscan’ which uses polarized light for detecting surface and inside reflective light independently. We also tested 15 different parameters for finding correlations between luminescence and those parameters. As a results, our 2 different brightening products showed 5 ~ 9 % increase of luminescence at 4 and 8 weeks. And we also found that skin roughness (-28 %), melanin index (-17 %), redness (-7 %), hydration (15 %), and lightness (6 %) were related to luminescence of skin.
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KEYWORD
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luminescence, brightening, efficacy test, perceptive efficacy, polarized light
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