@JohnPhilpin Years and years ago, I used this odd 35mm film intended for use in motion pictures. What was fancy about it was that it produced two images of each exposure: A positive (that was cut and mounted as a slide), and a negative (that could be used to make prints).
@philipbrewer The point was that the director could use the positive to project each day’s film and see that he got his shot.
I mention it because although the negative was very nicely color-correct, the positive had a distinct blue cast to it, making a picture of a cold breeze look chilly indeed.