The conk was a hairstyle popular among African-American men from the 1920s up to the early-to-mid 1960s. This hairstyle called for a man with naturally "kinky" hair to have it chemically straightened using a relaxer called congolene, an initially homemade hair straightener gel made from the extremely corrosive chemical lye which was often mixed with eggs and potatoes. The applier had to wear gloves and the solution timed just right on the applicant's head and then thoroughly rinsed out with cold water to avoid chemical burns. The desired outcome was for the newly straightened hair to be easily styled in the popular "conk" style of that era.

Kinky hair, also known as afro-textured hair, is a human hair texture prevalent in the indigenous populations of many regions with hot climates, mainly sub-Saharan Africa, and some areas of Melanesia, and Australia. Each strand of this hair type grows in a repeating pattern of small contiguous kinks. These numerous kinks make kinky hair appear denser than straight, wavy, and curly hair types.