skin color measurement:
skin color was measured using minolta chroma meter, model CR-200. calibration was done by a white plate before use. color changes were quantified in the L* C* and h°. L* refers to the lightness, ranging from 0=black to 100 = white, chroma represents color saturation which varies from dull(low value) to vivid color (high value) and hue angle is defined as a color wheel, with red-purple at an angle of 0°, yellow at 90°,bluish-green at 180° and blue at 270°
skin color measurement:skin color was measured using minolta chroma meter, model CR-200. calibration was done by a white plate before use. color changes were quantified in the L* C* and h°. L* refers to the lightness, ranging from 0=black to 100 = white, chroma represents color saturation which varies from dull(low value) to vivid color (high value) and hue angle is defined as a color wheel, with red-purple at an angle of 0°, yellow at 90°,bluish-green at 180° and blue at 270°
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