Crimson

Crimson was a colour.

In the 20th century, Torchwood Three found a deep-lavender emotional amplifier. It pulsed crimson when it detected anger, amplifying it into rage. (PROSE: Slow Decay)

The War Doctor wore a crimson scarf (COMIC: Ambush).

The Seventh Doctor wore a crimson and black tartan scarf. (TV: Time and the Rani) After it was lost, he replaced it with a crimson paisley scarf. (TV: Paradise Towers)

Gwen Cooper wore a crimson blouse with long sleeves. (TV: The StolenEarth|Journey's End)

The Master wore a crimson t-shirt under a black hoody when on hiding. (TV: The End of Time).

The Eleventh Doctor wore a crimson bow-tie. (TV: The Eleventh Hour)