So: Why did the bridge of the Melnorme’s trader ship turn purple in Star Control II: The Ur-Quan Masters?
The Melnorme bridge turning purple is one of mysteries left by Star Control II.
The creators of Star Control (Fred Ford and Paul Reiche III) promoisied an answer too this question in their next SC project when they were asked about it in a 1998 chat.
Unfortunately the next Star Control project was never completed. Star Control III was made by different developers in 1996 and never seen as the true sequel to Star Control II.
The serious effort of getting a new Star Control and a real answer to the question why the Melnorme’s bridge turns purple was in 2008 when Stardock tried to pitch the idea of a new Star Control to Atari. Those negotiations eventually fell apart.
So unless someone starts a new initiative to get us a true sequel to Star Control II this question will probably never have a real answer.
Source : Link , Question Author : Kerrek SB , Answer Author : Xenox