Another scene that has been discussed numerous times, is the Vader/soldier strangling scene. Currently there are three references for this scene, that I know of:

The Senator print photos (not known if the photo was color balanced):

The 1977 bootleg (probably not balanced, but VHS to digital transfer):

A recent photo of a projected technicolor print shared with me (not known if the photo was color balanced):

All three of these photos point (two of which are technicolor prints for sure) point to a very similar color grading, all of which are somewhat green shifted.