Once a scene or location's color grade is approved in its first successful generation, that palette is locked in and applied to every later shot in the same setting using a color-transfer tool (used in Soul Cinema in this workflow) rather than trusting each new generation to reproduce the look on its own.
This is a continuity technique in the same family as Blocking Lock via Position Reference and Clean Your Plate (Reference Image Prep for Video Generation) — each locks a different axis of consistency (color, position, background cleanliness) that the model won't maintain on its own, per Continuity Is the Creator's Responsibility (Not the Model's).
After the first shot in a location reads correctly, run subsequent shots in that location through color transfer against the approved shot so the whole scene shares one palette, rather than re-grading or re-prompting color for each new shot.