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2. Transparency (projection) - Wikipedia

   en.wikipedia.org/wiki/Transparency_(projection)

   Overhead projector in operation, with a transparency being flashed. A transparency, also known variously as a viewfoil or foil (from the French word "feuille" or sheet), or viewgraph, is a thin sheet of transparent flexible material, typically polyester (historically cellulose acetate), onto which figures can be drawn.

3. Photographic film - Wikipedia

   en.wikipedia.org/wiki/Photographic_film

   Print film, when developed, yields transparent negatives with the light and dark areas and colors (if color film is used) inverted to their respective complementary colors. This type of film is designed to be printed onto photographic paper, usually by means of an enlarger but in some cases by contact printing. The paper is then itself developed.

4. Overhead projector - Wikipedia

   en.wikipedia.org/wiki/Overhead_projector

   Appeldorn developed a process for the projection of transparent sheets that led to 3M's first marketable transparency film. The Strategic Air Command base in Omaha was one of the first big clients, using circa 20,000 sheets per month. 3M then decided to develop their own overhead projector instead of the one they had been selling until then ...

5. Lenticular printing - Wikipedia

   en.wikipedia.org/wiki/Lenticular_printing

   With the new technology, lenses are printed in the same printing operation as the interlaced image, either on both sides of a flat sheet of transparent material, or on the same side of a sheet of paper, the image being covered with a transparent sheet of plastic or with a layer of transparent, which in turn is printed with several layers of ...

6. Negative (photography) - Wikipedia

   en.wikipedia.org/wiki/Negative_(photography)

   Negatives were once commonly made on a thin sheet of glass rather than a plastic film, and some of the earliest negatives were made on paper. [4] Transparent positive prints can be made by printing a negative onto special positive film, as is done to make traditional motion picture film prints for use in theaters.

7. Tracing paper - Wikipedia

   en.wikipedia.org/wiki/Tracing_paper

   The transparency of tracing paper is achieved by careful selection of the raw materials and the process used to create transparency. Cellulose fibre forms the basis of the paper, usually from wood species but also from cotton fibre. Often, paper contains other filler materials to enhance opacity and print quality.