Figure 21. Simplified diazo process
b. Preparing the Master Copy. The drawing and base materials used
to prepare the master are a key element affecting the quality of the
diazo reproduction. For this process to function correctly, the paper
used to prepare the master copy must allow ultraviolet light to pass
through the areas not covered by the graphic, while the graphic must not
allow the ultraviolet light to pass through or penetrate to the diazo
film.
(1) Select correct diazo master. Therefore, you must use a
transparent film or translucent paper as the base material for a diazo
master. Usually, the use of a high grade of tracing paper for the
master results in excellent reproductions. Select a grade of tracing
paper with a fine fiber texture. Additionally, using the same grade of
paper for all masters eliminates changing the exposure time, which
decreases wasted film by
2-3
SS0530
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