New insight into the reason of the darkening of liquid foundation from the view of powder.

Perfect base makeup is the guarantee of exquisite makeup. However, the problem of darkening of base makeup seriously affects the instant cosmetic effect, which troubles the relevant researchers and consumers. In this work, some liquid foundations were prepared, and the darkening of liquid foundations of different colors were compared. The effects of evaporation of emulsifying system and sebum secretion were discussed. A non-contact colorimeter was used to monitor the color deviation to investigate the influencing factors of darkening. The results showed that the foundation darkening was not caused by oxidation. The red hue of the foundation darkened faster because the human eye was more sensitive to the color deviation of red. The volatilization and skin sebum secretion accelerated the foundation darkening process, which was caused by the change of foundation surface structure. Considering the above influencing factors, the formula was adjusted and an improved formula was proposed, which could significantly slow down the process of foundation darkening. [ABSTRACT FROM AUTHOR]