Mauve

Mauve was a shade of purple.

Donna Noble wore a mauve cardigan. (TV: Silence in the Library / Forest of the Dead)

Tegan wore a mauve skirt with her suit. (TV: Logopolis, Earthshock, etc).

The Eighth Doctor wore mauve trousers. (COMIC: Dreadnought)

The mauve alert was a common distress signal. Humans used red alerts instead, which led to some confusion. (TV: The Empty Child)

The xXltttxtolxtol pods that were sent through the Cardiff Space-Time Rift were marked with mauve, implying they were toxic. In truth, the xXltttxtolxtol just didn't want Torchwood Three to open them. (PROSE: Risk Assessment)

When Charlotte Pollard described Chief Steward Weeks' nose as being "redder than Mr Lenin's pyjamas", the Eighth Doctor disputed they were red; he claimed that they were a "sort of mauve" when the Doctor took a train with Lenin from Switzerland to Petrograd. (AUDIO: Storm Warning)

In an alternate timeline in which the First Doctor spent three months on Urbinia, his friend, Professor Feedlam discovered a new "little bit green and a little bit black" colour which the Doctor saw as "a sort of mauve". (AUDIO: Daughter of the Gods)