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Tetenal COLORTEC RA-4 Instrucciones De Uso página 7

Kit de impresión profesional rt

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Always use at least the minimum quantity of solution for the drum as recom-
mended by the manufactures.
for roller-transport machines the correct processing time can be calculated
simply by developing two strips of paper, one exposed (5-10 seconds room
light), the other unexposed . If the exposed paper has blue blacks and the
unexposed paper has normal fogging, increase the temperature in incre-
ments of 1 °c until the desired result is achieved. If, on the other hand, the
exposed paper has good blacks but the unexposed paper shows excessive
fogging, simply reduce the temperature incrementally.
Processing with replenishment: after the 2nd throughput, replace 1/3 of the
original tank contents with fresh solution. the bleach fix time must be ex-
tended by 15 seconds, but all other times remain the same.
dEvIATIONS IN RESulTS
results
Possible causes
light and dark
not enough processing solu-
streaks, blue
tions
stains
drum not horizontal during process
colour developer over-diluted
Blue blacks
Inadequate agitation, colour
de veloper temperature too low or
colour developer time too short
colour developer over-exhausted
Bleachfix time too short, or
Grey mottled tex-
bleachfix bath exhausted or
ture or dirty grey
very contaminated with colour
coating
developer
faulty exposure due to unsuit able
colour cast can-
safelight or lc diodes
not be filtered out
colour developer is contami nated
Blue or magenta
with bleachfix bath
colour shifts
uneven stopping action in the
Magenta streaks
bleachfix bath
remedy
use quantities recommended by the drum
manufacturer.
set drum horizontal
use right quantity of water for mixing
stronger agitation, and/or raise
temperature of colour developer by
1 °c/33,8 °f, and/or increase colour
developer time by 10% to 20%
replenish colour developer or mix fresh
Increase bleach-fix time or re bleach-fix
the print.
use safelight suitable for colour or expose
in absolute darkness
clean measures and mixing containers.
with drum processing also clean the lid of
the drum at the end
use of a stop bath after colour develop-
ment is recommended
7

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