Look up a 10 neutral density in section A figure 5-3.
The neutral density
factor comes out to 1.3 in this case.
Step 3B.
If all the filter values are positive, subtract C, M, and Y
"neutral density" equal to the smallest positive filter value. At least one
of the three will now be zero.
Look up the neutral density factor in
section B in figure 5-3.
Step 3C. If the filter values are positive and at least one is zero, go to
step 4. Your neutral density factor is 1.0.
Step 4.
Calculate the new exposure time by the following formula:
Example: Step 4. Exposure Time for New Emulsion = Exposure Time for Old
Emulsion X (Neutral Density Factor).
New Exposure Time = 8.5 x 1.3 = 11 seconds.
This is the new exposure time that should be tried for the new emulsion.
Use the new filter pack and the printing times calculated as a starting
point for a series of test prints using a standard transparency.
PART B - SILVER-DYE BLEACH (DYE DESTRUCTION) COLOR
PRINT PROCESS
In conventional chromogenic reversal color, the image-forming dyes are
produced during development by built-in colorless couplers which react with
products of the developing agents. These papers require a reversal process
using two developers and an intermediate exposure or an equivalent reversal
step.
In the silver-dye bleach process, image dyes are added to the emulsion
layers during manufacturing. During processing, they are removed (bleached)
from the emulsion layers in the areas where they are not required.
This
process requires only one developer and no intermediate exposure. The only
commercially available silver-dye bleach process available is the Cibachrome
process.
7.
Structure of Silver-Dye Bleach Materials.
Cibachrome color paper and display film have an identical emulsion layer
structure; the essential difference is the support.
Cibachrome II Pearl
Paper uses a resin-coated paper base, Cibachrome II Deluxe Glossy is coated
on white opaque polyester, and Ilford Cibachrome II Display Film is a
5-9
SS0514
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