It was octarine, the colour of magic. It was alive and glowing and vibrant and it was the undisputed pigment of the imagination, because wherever it appeared it was a sign that mere matter was a servant of the powers of the magical mind. It was enchantment itself. But Rincewind always thought it looked a sort of greenish-purple.
The Colour Of Magic: (Discworld Novel 1) (ed. Random House, 2008) - ISBN: 9781407034379