Onsible

Onsible was an ultraviolet color visible to members of the Nediji and the Umbaran species. Most other beings were unable to see the color, and few languages had a name for it. In 20 BBY, the Umbaran Squa Tront wore a garment called a shadowcloak while meeting with the Nediji assassin Kaird, who observed that Tront's shadowcloak was a mixture of colors such as onsible, berl, crynor, and nusp, which swirled together in a way that Kaird considered beautiful.

Text and facts from the “Onsible” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.