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Octarine, also known as the Colour of Magic or the King Colour, was the eighth colour of the Discworld spectrum. It was visible only to wizards and cats. It is described in The Colour of Magic as the colour of imagination and is a fluorescent greenish yellow-purple (using all the primary colours). The only time non-wizards can see it is when they close their eyes; the bursts of color are octarine.

The presence of octarine generally signifies the presence of magical energy, such examples are the Rimbow and places where a spell of a significant level of wizardry is taking place such as Unseen University.

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