Yellow in nature
Species which possessed yellow skin included the Doradans (PROSE: The Dream Masters) and the Megallans. (PROSE: K9 and the Zeta Rescue) while the Arunde possessed yellow fur. (AUDIO: The Fifth Traveller) Although most Time Lords had skin tones comparable to humans, at least one had bright yellow skin. (PROSE: K9 and the Zeta Rescue)
The term "yellow" had two connotations on Earth: as a sign of cowardice, and as a racial slur against Asians. While convincing an Asian friend to help her break in somewhere, Ace told him "don't be so yellow," before realising and regretting the expression. (PROSE: The Hollow Men)
In comparison to other colours like red or black, yellow and purple were inferior psychological triggers in humans. As such, a Yellow Eye of Eternity never appeared in Through the Eye of Eternity. (PROSE: The Book of the War)
Demons Run was placed on yellow alert as the Eleventh Doctor assembled an army from across time and space to rescue his companion Amy Pond and her baby daughter. This period of yellow alert lasted three weeks which climaxed with the Battle of Demons Run. (TV: A Good Man Goes to War)
The Fragile Yellow Arc was one of two epochs in the lives of the residents of the planet Fragrance. It was the time from which a person fell in love until the time they died. (AUDIO: The Fragile Yellow Arc of Fragrance)
- The Eternal Dalek's yellow and black colour scheme was described in The Brilliant Book 2011 as the most dangerous colours found in nature.