What about Scano's color-changing lipstick?

Scano's color-changing lipstick is very good. The main raw materials of lipstick are oil (castor oil), grease (lanolin) and wax (beeswax). Beeswax can improve the hardness of lipstick; Lanolin, as a solvent of pigment, can improve the dispersibility of pigment; Castor oil gives lipstick stickiness and enhances the coloring of lips. A new color-changing lipstick made of shuhong pigment, with pH value of 3, is light brown before rubbing, and turns red when rubbed on lips. I think the reason for this color change is the change of PH value. Eosin acts as an acid-base indicator, which is a chemical reaction and has no effect on health.