The story
Genericized trademark of a Resene paint color named after the genus Tundora. The word was popularized as a color name in web contexts by the website Name that Color starting in 2001; in addition to the usual color names, that site also drew on a file mapping Resene paints to RGB triples, treating these trademarks as generic, a practice then imitated by other sites.
Etymology from Wiktionary, CC BY-SA 4.0.