Beautiful and Terrible wrote:
Also, I remember reading that when the new producers were planning the look of STII, they made a deliberate decision to go with "almost" but not quite primary colors
The same costume guy, Robert Fletcher of TMP, did the later movies too. He hated "straight" colours and used the same strategy in that first movie. Spock's black robe wasn't a true black, Kirk's admiral uniform was "loden green", but appeared grey to some, etc.