TM 5-3610-259-14
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Standard maskinq materials should always be used in making the flat. These are
materials that will prevent the exposing light going through to the plate. In
the stripping procedure on the light table, however, film can be read through
the masking sheet.
The film contained in the flat should be free of pinholes,
dust, dirt, and tape adhesive residue.
Since the plate must pick up fine detail such as fine halftone dots, the plate
will also reproduce pinholes, opaquing, and dust specks on the image area.
Pinholes should be covered with opaquing solutions prepared for this purpose.
Film should be cleaned with film cleaner or an anti-static brush.
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