White was a colour.
During the Imperial-Renegade Dalek Civil War, Davros's Imperial Daleks had white casings. (TV: Revelation of the Daleks, Remembrance of the Daleks) A white Dalek was present on Moldox near the close the Last Great Time War. (PROSE: Engines of War) Later, the Supreme Daleks of the New Dalek Paradigm were identified by their white casings. (TV: Victory of the Daleks) A white Dalek was present at the Starbane. (GAME: The Doctor and the Dalek)
In 1955, Alabama, people who were perceived as white were allowed to ride at the front of buses while all those who were viewed as non-white were made to get on via a side entrance and forced to sit at the back. Also, there were even whites-only motels, like the Sahara Springs Motel. (TV: Rosa)