Kreinik has republished the list of thread colors they’ve had to discontinue because they can’t get the materials to make them any more.  Kreinik suggests you print out the list and put it with your thread stash to consult before you start a project that needs a lot of one of their threads or before you try to kit an older project with a specific thread list.
http://kreinikthread.blogspot.com/2019/04/discontinued-kreinik-thread-colors.html