If you, dear reader, have ever seen a screening of an IB Tech print – short for imbibition Technicolor – you will find that colors are as vibrant now as they were 65 years ago. Acetate colors tend to degrade and fade faster, causing older prints developed by Kodak to look red and washed out. Prints made in Fujicolor’s laboratories tend to fade to a gentle blue. As the acetate begins to decompose, it gives off a strong chemical odor resembling that of vinegar, a serious degradation that many manufacturers believe can spread from one print to another. This is what the internal movie term “vinegar syndrome” refers to.
The three-band Technicolor process was not new in 1952. Indeed, it was only a few years away from being completely decommissioned. The first three-strip Technicolor feature film is Rouben Mamoulianof “Becky Sharp” from 1935, photographed by Ray Rennahan of “Gone With the Wind” famous. The first three-strip short was Disney’s animated short “Flowers and Trees”, also shot by Rennahan. Disney was an early adopter of this process.
Stanley Donen, in a 2009 interview with the DGA quarterly, recalls the feeling of filming with a three-strip camera. Because there is triple the amount of film in each camera, these machines are heavy and huge, requiring extensive lenses and huge film cases. Donen also recalls that the three-band Technicolor needed more light than any previous camera. There is no way to make anything look “natural” during the three-strip process.
https://www.slashfilm.com/969319/shooting-in-color-caused-some-problems-behind-the-scenes-of-singin-in-the-rain/ Color photography caused some problems behind the scene singing in the rain