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Physical Structure

The structure of the celluloid film in Black n White film era looks like this （see Figure 2). At first there are only black n white film, but with adding color sensitive layer, color film came out (see Figure 3). Both color film and black n white film has protective coating and anti-halation backing and film base. The difference is, black n white film using small light-sensitive silver halide crystals for light sensor, It can only show the depth of the film. While color film using more complex chemical to filter different color of light.

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People use different materials as film before, such as glass or paper. Celluloid was introduced by Eastman Kodak company in 1889. It is highly flammable, but it shows image clearer. There is also an important invention that facilitate the birth of film industry is Kinetoscop, it provided the idea of motion pictures. We all know that celluloid film is actually make a simulation or illusion of  video, not same as the video we saw today, celluloid film is actually using a long film stock contains lots of frame, with one picture on each frame, and move them so fast to make them look like a video. With this idea and the development of technologies, filmmakers, celebrities, movie theater workers, and many different social groups, stakeholders got involved in the industry. It became a weapon of political propaganda in the First World War. People added soundtrack on the film stock in pre- World War Two period to make it more influential. And by 1930s, the development of color film techniques made colors became popular in film making.