Chemicals for Process RA-4. The RA-4 process is a
washless process that consists of color developer,
the RA-4 process is about 4 1/2 minutes.
may not have been equal overall. That can create
problems in printing. Generally, slide duplicates vary
widely in quality and do not make high-quality color
prints by using color printing materials on a transparent
film base. These transparencies are of excellent quality.
This allows you the option of making them larger,
smaller, or the same size as the original negative.
Ektachrome 22 paper is a reversal color paper that, when
exposed to a slide, produces a positive color image of
the slide. Kodak Ektachrome 22 paper is processed in
concerning these processes.
common are Kodak Duratran RA and Kodak Duraclear
RA display materials. These materials allow you to
make large-display transparencies from color negatives.
process. At the time this training manual was written,
Cibachrome products are the only direct positive color
materials manufactured using this process.
as Duraflex RA print paper. Both the transparencies and
paper are processed using Kodak Ektacolor RA-4
chemicals; however, the transparency materials require
allows for this longer processing time. By flipping a
switch, you can slow down the processor, allowing for
a longer processing time.
emulsion layers on one side and a matte, anticurl gelatin
on the opposite side. This white pigmented plastic film
base has a similar appearance to paper but is actually a
film, much like color slide materials-the emulsion
layers are arranged in the same order as color
transparency (slide) materials (including the yellow
have a paper backing, light is transmitted through the
material and reflects back when a black easel is not used.
All other printing steps are the same in printing color
paper and color transparency materials. Consult the
Photo-Lab-Index for starting exposure and filter pack
dyes in Cibachrome materials are incorporated in the
blue, green, and red light-sensitive layers during
manufacturing. These cyan, magenta, and yellow dyes
dyes, green exposure leads to the destruction of magenta
dyes, and blue exposure sets up the destruction of yellow
making an internegative, but the quality of a print can
only be as good as the quality of the transparency from
which the print is made. Originals that are poorly
exposed or processed or are damaged or dusty do not
provide satisfactory prints.
developer, the exposed silver halide crystals are reduced
to metallic silver. When the silver halides in the
emulsion layers are converted to metallic silver, the dyes
present in the emulsions are fragmented. In the bleach,
the silver image is converted back to silver salts
(halides), and the dye fragments are made either
colorless or water soluble. The unwanted silver salts
(halides) are then removed in the fixer. The stabilizer
keeps the remaining color dyes more permanent.
Basic Photography Course