Heliotrope was a colour. It was a shade of purple. (PROSE: Seven Deadly Sins) The Time Lords of the Patrex Chapter on Gallifrey wore heliotrope robes, (TV: The Deadly Assassin) including Tebediatroculozan, an Academy peer of the Doctor. (PROSE: Seven Deadly Sins) In the Fifth Doctor's nightmare of his time at the Time Lord Academy, his instructor Delox always wore full heliotrope coloured robes and neck brace. (PROSE: Divided Loyalties)