How should the bump side of film be oriented on a viewbox?

How should the bump side of film be oriented on a viewbox?

• A. Bump facing up, towards ceiling
• B. Bump facing down, towards floor
• C. Flat side up
• D. Flat side down

Answer: (A)

The bump side is the emulsion side of the film, the sensitive layer that records the image. On a viewbox, orient the film with that bump side facing up toward the ceiling so the emulsion is toward the viewer. This positioning makes the radiograph easiest to read because you’re looking through the emulsion against a uniform illuminated background, giving better contrast and detail. It also helps keep the emulsion away from the viewbox surface, reducing the chance of scratches or fingerprints. If the flat side were up, you’d be viewing the non-emulsion side, which can appear dull and reduce image clarity.

The bump side is the emulsion side of the film, the sensitive layer that records the image. On a viewbox, orient the film with that bump side facing up toward the ceiling so the emulsion is toward the viewer. This positioning makes the radiograph easiest to read because you’re looking through the emulsion against a uniform illuminated background, giving better contrast and detail. It also helps keep the emulsion away from the viewbox surface, reducing the chance of scratches or fingerprints. If the flat side were up, you’d be viewing the non-emulsion side, which can appear dull and reduce image clarity.