High contrast continuous tone developer and process of use

Details High contrast continuous tone developer and process of use High contrast continuous tone developer and process of use

1977-12-16

1979-10-30

Kelley, Mary F.

Gas separation: apparatus

Electric field separation apparatus

Including gas flow distribution means

96 663, 96 664, 96 665, 96 60BF, G03C 530, G03C 532

Patent

active

041727282

ABSTRACT:
A photographic developer containing hydroquinone, an auxiliary developer such as phenidone, and high sulfite is formulated using an organic base such as diethanolamine. This is useful for processing litho film in rapid access machine processors to produce high contrast line and half-tone dot images from films processed therein.

REFERENCES:
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patent: 1925557 (1933-09-01), Dundon
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patent: 2657138 (1953-10-01), Robbins
patent: 3000736 (1961-09-01), Karlson
patent: 3232761 (1966-02-01), Allen et al.
patent: 3552969 (1971-01-01), Henn et al.
patent: 3576633 (1971-04-01), Henn et al.
patent: 3615488 (1971-10-01), Drago et al.
patent: 3762923 (1973-10-01), Sugiyama et al.
patent: 3972719 (1976-08-01), Vanreusel et al.
patent: 3984243 (1976-10-01), Shimamura et al.
patent: 4022621 (1977-05-01), Hayashi et al.
Wiederman, Science et Industries Photographiques, vol. 32, No. 4, 1961, pp. 97-107.

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