What is the purpose of the copper/wire mesh tool in screen/film contact testing?

• A. To measure emulsion thickness
• B. To ensure even contact across the screen
• C. To check film edge sharpness
• D. To determine copper content

Answer: (B)

The main idea is that screen-film resolution relies on how closely the screen sits against the film. A copper/wire mesh placed between them creates a known grid that gets captured in a radiograph. When contact is uniform and tight, the grid appears with clear, consistent lines across the whole field. If there are gaps or uneven contact, the grid lines blur or disappear in those areas, revealing where the screen and film aren’t in good contact. Using this test helps ensure the contact is even across the screen, which is essential for maintaining sharp detail. It isn’t used to measure emulsion thickness, assess edge sharpness directly, or determine copper content.