Title: How photograph is made - material, production process, manufacture, making, used, processing, structure
Headings: 
Photograph
Background
Raw Materials
Film
Developing and printing materials
The Manufacturing
Process
Exposure
Development
Printing
Quality Control
The Future
User Contributions:

Content: After 160 years, the daguerreotype remains unsurpassed for its clarity  and precision of image. Some claimed that you could count the hairs on  the head of the subject, while others complained that the daguerreotype  unflatteringly revealed every line and wrinkle. This daguerreotype was  likely commissioned by a mother in order to remember her beloved  daughter and son just before the Civil War. Others captured houses,  farms, siblings, laborers, famous politicians, children alive and  deceased, and even scantily-clad prostitutes in these early Victorian  photographs. Nancy EV Bryk
One common method for coating these plastic films is to dip them into a  trough or tray containing the molten emulsion. As the film exits the  trough, excess liquid is removed by a knife edge or air jets. Another  coating method runs the film below a hopper filled with the emulsion. As  the film passes under the hopper, the emulsion is dispensed onto the film. After coating, the emulsion is spread evenly on the film with rollers and  is transported to a cooling chamber where the emulsion gels. Finally, the film is sent through a heated chamber which  dries and hardens the emulsion.