Figure 20. Preparation of transparency by using sepia lithofoil intermediates.
(3) Remove the original and the master from the plate glass
sandwich, and place the exposed film over the master in
register.
(4) Apply Bruning developing solution of the desired color to
the appropriate areas with a brush or cotton-tipped stick.
Use a separate applicator for each color solution.
Note. Dissolve Bruning developing salts for the desired colors in
water, and place the solutlons in labeled bottles.
(5) The unexposed portions of the film will develop in color when
painted with the solution. Since exposed portions of this film
will not react, to the solution, the operator need not be too
careful about staying within the area to be colored.
31. Masking and Mounting
a. General. Transparencies may be masked for the following
purposes-
(1) For convenience in holding the transparency in position on
the projection stage.
(2) To prevent the transparency from curling.
(3) To provide rigidity for vertical filing.
(4) To add a margin for notes and markings.
b. Single-Cell mounts. Center the transparency on the mask and
tape it on all four sides. Place the tape so that the edge of the trans-
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