COLOR RETENTION AND BLEEDING POTENTIAL OF A LIPSTICK 403 after 8 h of wear. A similar method was used for color bleeding, in which 90 panelists were instructed to review six pairs of IMM and H08 images, and to select the pairs exhib- iting “unacceptable” levels of bleeding. Those panel perceptual results were then corre- lated to their corresponding values of objectively measured parameters to determine a threshold of acceptability. Figure 2. Illustration of detected lip areas for color bleeding calculation. (A) Lips at the BSL time point, (B) lips at the IMM time point, and (C) Lips at the H08 time point. The zig-zag lip border in (C) refl ects the result of color bleeding. Line roughness and color bleeding potential can be calculated from the outlined re- gions of interest using equation (2).

JOURNAL OF COSMETIC SCIENCE 404 Figure 3. Distributions of the objectively measured lip color properties 8 h after application. (A) Color re- tention and (B) bleeding potential. Bars: actual distribution curves: normal distribution.