Purple

Purple was a colour.

The Thin Purple Arc was one of two epochs in the lives of the residents of the planet Fragrance. It was the time from a person's birth to when they fell in love. (AUDIO: The Fragile Yellow Arc of Fragrance)

Celery turned purple in the presence of gases in the Praxis range of the spectrum. One of the reasons the Fifth Doctor wore a stalk of celery in his lapel was to detect such gases. (TV: The Caves of Androzani)

The Eighth Doctor kept a purple Volkswagen Beetle in an alcove in his TARDIS, which he and Sam Jones drove on numerous occasions. (PROSE: Vampire Science, Longest Day, Seeing I).

Omphalos Prime was described by Leabie Forrester described as a cold, purple world. (PROSE: Dependence Day)

Ukkans were light pink-skinned humanoids with enlarged purple craniums, around a dozen purple tendrils on the head, and purple lips. (TV: Lost Library of Ukko)