Bergger Prestige Variable CB Warmtone Baryta Paper (Glossy double weight FB)
All boxes contain 25 sheets
Available in 8x10, 11x14, 16x20, 20x24, and Roll (127cm x 10m)
Prestige Variable CB from Bergger is a warmtone chlorobromide fiber based paper with a glossy surface finish, and is designed for traditional black and white printing and enlarging. Featuring a baryta-coated double-weight, 280 gsm white base, this polycontrast paper uses both green and blue chromatic sensitizers to deliver six full grades of contrast along with a high Dmax and rich, warm black tones.
A red safelight (such as one fitted with a Wratten 1A filter) is recommended. With a 15 watt bulb used direct illumination, minimum working distance is 5 feet. Safelight exposure longer than 2 minutes may lead noticeable fog. It is a good idea to test for safelight fog time-to-time.
PRESTIGE VARIABLE CB can be exposed with any enlarger or printer light source. As with all VC papers, be aware that some older types of cold-light tubes may normally require more yellow filtration. Also, note that exposure times depend upon which filter is in place. For example : if 8 sec. is correct for filters number 0, 1, and 2; then filter 3 will require 9 sec. and filters 4 and 5 : 27 sec.
Process in any good paper developer at 68°F (20°C) for 1.5 to 2 min. with continuous agitation. The BERGGER "Ecco" and BER-98 developers work particularly well with this paper.
An acid stop bath is optional but recommended. It quickly stops development by neutralizing alkali. This also helps extend fixer life. Dilution : 45 cc of 28% acetic acid in 1 liter of water. Treatment time : 15 sec. 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 68°F (20°C). Normal fixer capacity is 1.5 sqm/liter. 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 the second fresh bath. With ammonium thiosulfate (fast) fixers, treat for 30 to 45 seconds only, then give a thorough pre-washed for 5 min. Next, treat with a washing agent (see WASHING below) with frequent agitation for 10 min. before transferring to a final wash.
The use of a wash agent (such as Kodak Hypo Clearing Agent) will reduce your wash time and increase its efficiency. It will also help guarantee the permanence of your photograph. Wash PRESTIGE in running water at rate fast enough to completely change water once every 5 minutes. Wash time is 1 hour at 68°F (20°C) or 30 min. if a wash agent has been used.
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.
PRESTIGE VARIABLE CB may be toned, retouched, spotted and mounted using normal methods.