Perfect eyeliner application is a delicate process. New tricks and tips are constantly being introduced, despite the long history behind the product. As early as 10000 B.C., the people of Egypt and Mesopotamia were lining their eyes with kohl, an early eyeliner often made by mixing toxic materials together. While the exact reason this trend started is unknown, it's possible that it was used as a way to protect against the evil eye. The cosmetic fell out of favor but was revived in the 1920s when King Tut's tomb was uncovered and interest in Ancient Egypt renewed. The recent increase in women's independence also made the use of makeup more common. Since then, many kinds of eyeliner have been produced, including liquid and colored.