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Photo Paper: Variable CB
VARIABLE CB is a double weight photographic
paper with warm black image tone. Its heavy (300gm_), superb fiber base
gives it exceptional results. Surface is glossy.
VARIABLE CB can produce an image from a soft tone to
an exceptionally hard tone due to the emulsion incorporating both blue
and green sensitivities.By using a multi filter set, contrast range from
0 to 5 are available, in half grade increments from a single paper.
Handling
Red
safelight as for VC paper is recommended. With a 15 Watts bulb direct
illumination, minimum working distance is 1,5m. Safelight exposure longer
than 2minutes will lead to fog increase. It is a good idea to test for
safelight fog from time-to-time.
Exposure
VARIABLE
CB can be exposed with all enlarger and printer light source.
Be aware that some older types of cold light tubes may normally require
more yellow filtration. For instance, with Kodak filters, right exposure
times should be : 8 sec for filters number 0 ; 1 and 2 ; 9sec for filter
number 3 and 27 sec for filters number 4 and 5.
Development
Process
in any good quality paper développer at 20°C (68°F) for
1,5 to 2 min. with continuous agitation. BERGGER « ecco »
developers work particulary well with this paper.
Stop Bath
An
acid stop bath is optional but recommended. It quickly stops dévelopment
by neutralizing alkali. This also helps extend fixer life. Dilution :
25 cc of 28% acetic acid in 1 litre of water. Stop bath time : 15 seconds
or 20 to 30 seconds of water rinse.
Fixing (Maximum Time : 10
Minutes)
Treat in a conventional sodium thiosulfate fixer
for a minimum of 5 min. at 20°C (68°F). Normal fixer capacity
is 1,5 sqm/litre. A two bath fixing method (at 2,5 min per bath) may be
used to avoid under-fixing. When the first bath is exhausted, replace
it with th second bath and mix a fresh « second bath ».
With ammonium thiosulfate (« rapid ») fixers, treat for 30
to 45 seconds only, then give a thorough pre-wash for 5 min. Next, treat
with a wash-aid (see « WASHING », below) with frequent agitation
for 10 min before transferring to a final wash.
Washing
The
use of a wash aid (such as Kodak Hypo Clearing Agent) will reduce your
wash time and increase the efficiency of your washing. As well, it will
help guarantee the permanence of your photograph.
Wash PRESTIGE in running water at a rate fast enough to completely change
once every 5 minutes. Wash time is 1 hour at 20°C (68°F) or 30
min. if a wash aid has been used.
Drying
To
effect even and rapid drying, you may use a wetting agent as a final rinse.
Excess water should be removed from the surface of prints with a clean
sponge or squeegee. Prints may then be dried in dust-free air on drying
screens or in a clean photo-blotter.
Finishing
VARIABLE CB
may be toned, retouched, spotted and mounted using normal methods.
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