fine printing control, a specially designed and
constructed contact printer is used
supporting pad are necessary. "Contact printers,"
consisting of a sheet of glass hinged to a metal frame
and a pad assembly, are generally known as proof
printers (fig. 11-1). When such a device is not available
or is not large enough for the negatives to be contact
(such as a rubber typewriter pad) can be used.
Quarter-inch plate glass is heavy enough to keep the
negatives and paper flat and in contact during exposure.
The glass must be free of flaws, scratches, bubbles, and
dirt. For color contact printing, the glass should be water
white or crystal grade; otherwise, filtration is required
to overcome the color tint of the glass. The edges of the
glass should be beveled and the corners slightly rounded
or taped. This is a safety measure to prevent cuts when
the glass is being handled.
negative together under pressure from the glass.
paper emulsion side up on the pad material. The
negatives are then placed emulsion side down on the
paper and the glass is positioned on top. Then turn on
the darkroom under suitable safelight illumination.
the exposure. Any separation between the negative and
the paper results in an unsharp point in the image.
overhanging light bulb or a safelight, with the filter
removed, connected to a timer is a convenient
with exposing lights, safelights, and viewing lights
inside with a glass top. It has a hinged pressure cover to
hold the negative and paper in contact during exposure.
Switches on the printer control the lights in the printer
or the printer may have a built-in timer. Also, the contact
printer may be connected to an external timer.
Basic Photography Course