COLOURS OF XIANTHA
The Xianthans believe that everybody is born colourless, and that you develop colour as you experience life. Some things will give you more colour, and others will take it away from you. It is a personal thing; each person must assess their own progress. The rulers of the planet must be Panchromes - they are the people who have progressed most.
*The man who speaks to canths has a theory that there are one or more higher classes, which the visitor and Arcan belong to. He calls these postulated colours Exachromes.