I've been reading about the history of the LEGO palette, most notably the transitions in gray and pink that have happened over the years where older shades were more or less completely replaced with newer ones.
What is the shortest-lived official LEGO color or shade? To be clear, I'm asking about shades that were officially released for public purchase as a set or individually (so no prototypes, test runs, employee swag, or third-party retints). I'm also not concerned about what parts were specifically made in that color, just the history of the color itself. If a particular color appeared in a 1x2 plate for two years, that part was retired, but the color was then used for a 2x4 brick for a year, that counts as three years for the color.
For example, have there been any colors that were released in only one set or theme and were fully retired when that set or theme was retired, never to be revived again?