Figure 2-2. Simplified diazo process
a. Preparation. To prepare a master, make an actual size drawing on a sheet of tracing paper.
(1) You prepare the master using any available means, such as tracing a projected image,
tracing existing materials, tracing from a rough, or creating your own drawings.
(a) You can draw any layout work directly on your master using a light blue pencil, as
light blue does not reproduce on a diazo reproduction machine.
(b) When tracing existing materials such as a photo or map, place a sheet of tracing paper
over it and ink in all required lines. This, of course, produces results in a one-to-one ratio. If you
require other than a one-to-one image, you can enlarge or reduce either the original or the tracing using
a device such as a process camera. These camera images provide good originals for the diazo process.