Steel blue

Steel blue was a shade of blue colour that resembled blue steel, i.e., steel which had been subjected to bluing for protection from rust.

Josie Day wears a double-breasted steel blue tailcoat without sleeves. (COMIC: A Matter of Life and Death, The Lost Dimension)

Rose Tyler wore steel blue denim overalls when she met Queen Victoria and a werewolf during the Wolf attack of 1879. (TV: Tooth and Claw) She also wore a cropped jacket of steel blue leather on 1953. (TV: The Idiot's Lantern)

Jo Grant wore a steel blue denim pinafore when she first met Mark IV Daleks including a gold leader as well as their Controller and Ogrons during the Time Paradox Incident; (TV: Day of the Daleks) and when helping many versions of the Doctor and companions. (GAME: Lost in Time)

Jenny Flint wore a steel blue cravat during the Battle of Demons Run. (TV: A Good Man Goes to War)

Jo Grant wore a steel blue jacket when she met the Bannerman Road Gang, the Eleventh Doctor, and renegade Shansheeth. (TV: Death of the Doctor)

Nyssa wore a steel blue mini-dress over an ivory underdress. (TV: Mawdryn Undead-Terminus)

Tegan Jovanka wore a double-breasted trenchcoat done in charcoal grey with a steel blue trim. (TV: The Power of the Doctor; WC: The Passenger; GAME: Lost in Time)

Rosita Farisi wore a steel blue pinstripe petticoat when she helped the Tenth Doctor and Jackson Lake foil Cybus Cybermen during the 1851 Incident. (TV: The Next Doctor)

The Tenth Doctor wore a walnut brown tie with stylised peacock-eye steel blue and brown motif in honeycomb grid when he helps Elton Pope and meets an Abzorbaloff, (TV: Love And Monsters) during the Battle of Canary Wharf involving Mark VII Daleks including the Cult of Skaro versus Cybus Cybermen including Cyber-Leader One and Cyber-Leader Two as well as the fall of Torchwood One including Yvonne Hartman, (TV: Army of Ghosts|Doomsday) when recruiting Martha Jones after the Royal Hope Incident, (TV: Smith and Jones) when he and Martha join forces with William Shakespeare to defeat Carrionites on Southwark during 1599, (TV: The Shakespeare Code) when saying goodbye to the Face of Boe after helping him save New New York from Macra during 5,000,000,053, (TV: Gridlock) when meeting an older Tim Latimer during an Armistice Day, (TV: The Family of Blood) during an encounter with Pyroviles and Pompeii's volcanic end on 79 AD, (TV: The Fires of Pompeii) when he and Donna Noble encounter a Time Beetle from the Trickster's Brigade, (TV: Turn Left) during the Planetary Relocation Incident involving Davros and the New Dalek Empire as well as his siphoned regeneration which spawned the Meta-Crisis Doctor, (TV: The Stolen Earth|Journey’s End), and when he met Christina de Souza and space stingrays. (TV: Planet Of The Dead)

Professor Jericho and Dan Lewis wore alabaster and steel pinstripe shirts during the early 1900s, the 2021 Sontaran Invasion of Earth, and the Flux. (TV: Survivors of the Flux|The Vanquishers)

Janice wore steel blue denim jeans, which had a smiley face on their right leg. (GRAPHIC: Janice)

Melanie Bush wore a shirt and jeans of steel blue denim. (TV: Delta and the Bannermen)

Shirley Bingham wore a blazer of steel blue pinstripe when she witnessed the Toymaker's defeat and the Fifteenth Doctor's birth. (TV: The Giggle)

Many Sontarans wore steel blue space armour with navy helmets and pauldrons. (TV: The Sontaran Stratagem/The Poison Sky, The Last Sontaran, The End of Time, The Pandorica Opens, A Good Man Goes to War, The Crimson Horror, The Time of the Doctor; AUDIO: The Sontaran Ordeal, The Eternity Cage, The Great Sontaran War, The Sontaran Project; COMIC: Fugitive, When Worlds Collide, The Instruments of War, Supremacy of the Cybermen; GAME: The Gunpowder Plot, The Doctor and the Dalek)

Rona Bellows, a wheelchair-bound grandma, wore a steel blue scarf with alabaster symbols when when dreaming she was a scientist on the North Pole during Christmas Eve and able to walk because of dream crabs. (TV: Last Christmas)

Kate Stewart wore a steel blue shirt before and during the 2021 Sontaran invasion of Earth and the Flux. (TV: Survivors of the Flux|The Vanquishers)