This is the still Mike Verta posted of a star wars print being projected with a 70s bulb,
PS78
PS78 with a merged gold overlay to replicate the effect of the 70s bulb
What I'm trying to determine is is the Pre ANH bootleg different from PS78 colourwise because it was captured with a different bulb. Also is the cinematography of star wars dependent on this 70s bulb completing it/pushing it over the edge (i.e. the colours are muted and then the 70s bulb makes them shine , so it is not dynamic in contrast but still dynamic in colour). This is speculation - input/correction invited.
edit/add: or do some telecines just produce a slight hue change?