I mean by power of deduction I am not sure how this is debated as some sort of mystery for so long, personally I think it is a problem with the print. If everything is green it’s unlikely the LD decided to light everything green no matter what environment they were in?

It’s not a problem with the print. As shown above, the color shift in the Leia/R2 scene is uniform and much larger than any shift elsewhere in the print, that may be attributed to a technicolor green shift. The only way this scene will have a neutral color, is if every other scene in the first reel is a nice shade of pink. So, like Sherlock Holmes said: “Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth.”