diffusing screen
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diffusing screen
[də′fyüz·iŋ ‚skrēn] (graphic arts)
A translucent screen used in contact printing to ensure even diffusion of light; the screen is sometimes denser at those points immediately facing the electric lamps, to avoid increased light in those areas.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.