Gunmetal (colour)

Gunmetal was a dark shade of grey.

When the Third Doctor encountered a new Dalek command structure, Dalek drones were identified by their gunmetal grey casings. (TV: Day of the Daleks, Frontier in Space, Planet of the Daleks, Destiny of the Daleks) The Renegade Daleks had gunmetal and black casings. (TV: Resurrection of the Daleks, Revelation of the Daleks, Remembrance of the Daleks)

When she met the Eighth Doctor, Grace Holloway wore a gunmetal trenchcoat. (TV: Doctor Who)

wore gunmetal grey cargo trousers while in hiding. (TV: The End of Time)