Orange (colour)
From Tardis Wiki, the free Doctor Who reference
Orange was a colour, one of the seven colours of the spectrum. (TV: Sky)
The sky of Gallifrey was burnt orange at night. (TV: "A Desperate Venture")
Many species had orange skin, including Annarene, (PROSE: Relative Dementias) Galapogans, (COMIC: The Intergalactic Trials) Gonzies, (PROSE: Festival of Death) Sorbazarans (COMIC: The Mirror War) and the Tabbalac. (AUDIO: The Raincloud Man)
Scientist Daleks had orange casings. (TV: Victory of the Daleks)
Bill Potts referred to the US President as of 2017 as "orange". (TV: The Pyramid at the End of the World)