(2) You may attach nonadhesive materials, like card-weight paper to mylar, by using
translucent plastic tape. Although it lets light pass during exposure, and may be visible on the master,
this tape will not reproduce on the developed sheet.
(a) In selecting plastic tape for this purpose, you get the best results from one having a
thin base and high translucency. This type tape does not pucker or shrink as does ordinary cellophane
tape. You can place a strip of this tape on the margin of the master for making pencil notations.
(b) Do not use masking tape or other opaque tapes for this purpose, as their images show
up in the developed copy.
(3) The most common film used when producing an intermediate is K-MAX and contact
reversal film. Sepia intermediates make good transparency masking materials.
(a) To use a sepia diazo sheet as a mask, fully develop an unexposed KSP, K-MAX, or
501LC sheet of film.
(b) Place the developed film on a sheet of mylar over the master. Since this film is
transparent, you can see through it to cut out the image area.
(c) Then mount the image area in position on the sheet of mylar using transparent tape.
The image area covered by the sepia intermediate then prints as a solid color on the diazo sheet.
(4) Several companies manufacture the transparent, nontranslucent, self-adhesive film that is
ideal for making color separation. You apply these adhesive films over a sheet of mylar (they may come
with their own mylar backing). Since the film is transparent it is easy to see through and work with.
(a) To make the color separation, cut around the desired image area with a #11 X-acto
knife. After making the complete unit, remove the film from all nonimage areas. Since ultraviolet light
does not pass through the film, areas protected by it print on the diazo sheet.
(b) This film is usually ruby red (rubylith) or orange (amberlith) in color, and it reacts
identically when used as a masking material or for making color separations.
(5) Ruby red film also is available in tape form. You may use transparent yellow tape in
much the same way as the ruby