What was the shortest-lived color? 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?
Further to Alex's answer, from that source I found eleven colours that only lasted a year:

Fabuland Orange 1983
Very Light Orange 2000
Clikits Lavender 2005
Chrome Black 2009
Chrome Green 1999
Satin White 2020
Satin Trans-Light Blue 2020
Satin Trans-Dark Pink 2020
Glitter Trns-Orange 2020
Speckle Black-Copper 2006
Speckle DBGray-Silver 2006

Of course the four 2020 colours may continue next year!
Fabuland Orange was only used for one item in one set for one year, so could be considered the rarest colour.  The set was &quot;Peter Panda Takes a Bath&quot;, and the part was Peter Panda's tub, a part barrel affair.