Black

Black was a colour.

The Master usually dressed in all-black clothes. (TV: Terror of the Autons ) The Trickster normally wore a long black hooded robe and gloves. (TV: Whatever Happened to Sarah Jane? )

The Host of the Lupine Wavelength Haemovariform had all-black eyes. (TV: Tooth and Claw) Mercy Hartigan's eyes turned all-black when she was converted into the CyberKing. (TV: The Next Doctor) Owen Harper's eyes turned all-black when he was possessed by Death. (TV: Dead Man Walking)

Black Daleks were identified by their black casings

Nostrovites had black blood (TV: Something Borrowed), as did the Process. (PROSE: Cat's Cradle: Time's Crucible)

Black roses grew on Florana. (AUDIO: The Elite)

Although not a Black Dalek, Dalek Sec, leader of the Cult of Skaro had a completely black casing