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.[source needed]
Nyssa wore a steel blue mini-dress over an ivory underdress when she met Spillagers on Switzerland during 1963, (AUDIO: Winter for the Adept) on Nightjar & Nemesis, (AUDIO: Pursuit of the Nightjar) when she first meets Vislor Turlough and Alistair Gordon Lethbridge-Stewart, (TV: Mawdryn Undead) and when she left the Fifth Doctor to stay and tend to patients on Terminus during 3480. (TV: Terminus)
Josie Day wears a double-breasted steel blue tailcoat without sleeves. (COMIC: A Matter of Life and Death, The Lost Dimension)
Rose Tyler wore a steel blue denim pinafore 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)
Liz Shaw wore a steel blue jumper when she met Sylvia in the 1970s. (AUDIO: Intelligence for War)
Tegan Jovanka wore a double-breasted charcoal grey trenchcoat 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)
The Sixth Doctor wears a steel blue brocade waistcoat during his Christmas adventure and his encounter with Were Lords. (AUDIO: Blood on Santa's Claw|The Baby Awakes|I Wish It Could Be Christmas Every Day|Brightly Shone The Moon That Night)
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)
20th century nurses wore steel blue dresses under white aprons as part of their uniforms. They included Albertine, (AUDIO: Year of the Pig) Molly O'Sullivan, (AUDIO: The Great War - Eye of Darkness) and Joan Redfern. (TV: Human Nature, The Family of Blood)
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)
Morris Gibbons wore a steel blue shirt when Sutekh returned. (TV: The Legend of Ruby Sunday)
Roger ap Gwilliam wore a double-breasted peacoat of steel blue herringbone on 2046. (TV: 73 Yards)
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)
Bertie Potts wore a scarf and cravat of steel and rust brocade. (AUDIO: The Boundless Sea-The Rulers of the Universe)
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)