DUMBASS derp-d said:
Leaving Darth Vader's lightsaber white in a single wide shot in ANH was a clue to the true fans that there was still good within the heart of this Dark Lord, that's why it's never been fixed. GL decided that he would compose such a shot as early as 1973, when he drew up his six film epic titled 'The Tragedy Of Darth Vader'
I believe I can fly. I believe I can touch the sky ...