Abstract:

As a color cosmetic product, lipstick not only brings beauty, but also pursues the instant effect of makeup. Currently, there are few papers on lipstick makeup retention test. The aim of the study was to establish a comprehensive and objective evaluation index and grading map of lipstick durability. Firstly, the volunteers who applied lipstick were subjected to artificial interference processing to simulate the lipstick take-off process and the lip image of the volunteers were captured by VISIA-CR. Then Image Pro Plus （IPP） software was used to analyze the front face photos taken by VISIA-CR under natural light, and SPSS 22.0 statistical software was applied to perform correlation analysis and factor analysis between indicators. Finally a mathematical model was established to objectively determine the lipstick color persistence and to establish a grading map. The results show that in the objective evaluation of lipstick image data, the color and uniformity of the lipstick are the main factors influencing the calculation of makeup retention index. The established lipstick retention grading map divides the durability of lipstick into 6 levels. The retention rate of level 1, level 3 and level 6 are 100%, 89% and 15%, respectively. And the makeup retention rate decreases as the level increases. The research results can provide technical support for the determination of lipstick makeup retention. It can also be used for market development and consumer market research. The atlas gives an objective and quantitative judgment on lipstick rentention ability. The subjective judgment of the level of lipstick makeup removal will be affected by the surrounding environment and personal subjective consciousness. The model can be applied to judge the level of lipstick makeup removal by collecting relevant index data. In the future, it is interesting to explore other color lipstick models, such as orange, brown, pink, etc. This experimental method has laid a solid foundation for the experimental research and data analysis of lipstick.

Key words: lipstick, makeup retention rate, persistence, grading map