In The Color of Magic by Terry Pratchett, octarine is described as the eighth color of the Discworld spectrum, visible only to wizards and cats. It is a greenish-yellow-purple, a paradoxical hue that ordinary people cannot see. It is often associated with magic itself, as it is the color of raw magical energy.

  Octarine is emitted by highly magical objects, places, and beings, serving as a visual indicator of enchantment.

  Wizards who can perceive octarine often see it radiating from spellbooks, magical artifacts, and creatures imbued with strong magical properties.

  The story has been taken without consent; if you see it on Amazon, report the incident.

  The name is derived from octo (eight), signifying its place beyond the standard visible spectrum.

  Not

  Forbidden colors

  UV

  IR

  Pink

  Q dots

  Gold

  HR task

  Negative

  Chimeric

  Self luminous

  Hyperbolic

  Ventablack

  Watercolor i

  Hyper luminous

  Fractal

  Day/night

  Potoreceptors, +other body parts

  --) Neural procesing

  Cherenkov

  Tribo

  Foxfire

  Luciferase

  Sono

  ...