Cellulose nitrate film material was the first successful transparent, flexible stock. It made roll film and motion picture (cine) film possible. The bad news was cellulose nitrate self-combusted at about 300°F. The movie houses of that era used carbon arc as the projection light source. If the film were to break during a movie, the stopped film would likely catch fire. I think a movie theater burned down every day, somewhere in the world. This changed in the 1950’s when the formula changed to cellulose acetate. This new film base will burn, but it self- extinguishes. This material is labeled “safety film”.

An informative and entertaining read on the development (no pun intended) of the use of cellulose in photography. Exploding Photographers, Disappearing Clothes, and the Development of Film

In my opinion, the same film emulsion coated on either will be visually the same. The likely reason someone would admire black & white movies of the earlier era is the fact that early photo film was sensitive only to violet and blue. As film making progressed, films gained sensitivity to green (orthochromatic) and then to red (panchromatic). This progression improved the monochromatic rendering, Blue only and the blue-green sensitive films presented an image with lots of contrast. The latter panchromatic materials were more subdued. Some might say the older materials were better, but others like me would disagree.

As to the first successful motion picture color film process, Technicolor, the camera exposed three black & white films simultaneously. Each was uniquely exposed to one of the three light primary colors via strong red, green, and blue filters. The three black and white films were each printed on a special film emulsion called a matrix. The matrix displayed a positive image (black & white transparency). The matrix film was developed in a “tanning” developer and the result was a relief image. By relief, I mean the image had depth. The depth of the image (thickness) of the emulsion varied in proportion to the amount of silver in any given location.

The three matrix films were soaked in dye. Cyan dye for the film that recorded the red image, yellow dye for the film that recorded the blue image, magenta dye for the film that recorded the green image. The dyes soaked into the film in proportion to the swelling of the emulsion.

A release print film was made for projection at the theater. The release film was a gelatin coat on the cellulose nitrate base. The three matrix films were pressed against the release film. Under pressure, the dye in the matrix film was squeezed out and transferred to the release film. This dye transfer was made three times. Because the release print film was a non-photo chemical material, the choice of dyes that could be used was vast. Today’s color films are super restricted as to what dyes can be used. This hinders their final appearance.

Some will say the Technicolor process was the grandest of all the color cine film methods. Some will say its yield was too contrasty and too vivid. I say, “a tip of the hat to those who devised this marvelously wonderful photographic tool”. By the way, it had a still picture counterpart called Dye Transfer. Most would say, the colors of the Dye Transfer process top anything you have ever seen on photographic paper.