The following shows a wide variety of ways to arrive at your final image. However, you can also use some films to make positive slides or display transparencies in a range of contrasts. Kodak makes a variety of films for producing duplicate negatives, copy negatives, positives, and images with special-contrast properties.
Duplicate negatives are copies of other negatives.
There are two ways to make a duplicate negative. The second way is to expose the original negative onto another negative film to obtain an interpositive. Then expose that interpositive onto a second piece of film. This applies especially when you need to alter the contrast of the original. These papers are made from a chemically pure paper base coated with a bright white barium sulfate layer over which the emulsion is coated.