5) Spit Cake
Back in the days when mascara came in cake form and one had to add moisture to create a useable paste, many women would use their own spit for this purpose, leading the product to affectionately be called spit cake.
The carmine red color used in rouges and lipsticks was once derived from cochineal insects. The red pigment that the insects produce has been in use for thousands of years. It might sound gross, but this ingredient is still sometimes used to color food and cosmetics!