CatBus said: Technicolor prints retain their color better than most anything else (assuming they got the right color to begin with, which was a bit of an issue with Technicolor in its earlier days, but not really with Star Wars), so for a color reference, you could do a lot worse. So I agree wholeheartedly with Fang Zei, if you replace "can" with "should".
Speaking of color references, what did they use as a color reference when creating 97 ESB and 97 ROTJ?