The diazo process requires the creation of master artwork. Prepare this art
on a good quality, fine fiber translucent or transparent paper. Make the
image area opaque. Light must pass through areas that are not to result in
an image, while opaque areas are necessary to block the ultraviolet light for
an image to appear. Use the same paper stock for all images in the series.
This procedure eliminates changing exposure time in the diazo printer and
minimizes film waste. Master artwork for the diazo process is a one-to-one
reproduction ratio. For enlargements or reductions, use a copy camera. You
can use the same master artwork repeatedly.
Figure 2-23 shows a simplification of the diazo sandwich.
Figure 2-23. A simplified diazo sandwich.
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