Photographic developer

Details Photographic developer Photographic developer

1974-12-09

1977-02-22

Kelley, Mary F.

Gas separation: apparatus

Electric field separation apparatus

Including gas flow distribution means

G03C 530

Patent

active

040090361

ABSTRACT:
A black and white developer solution containing o- or p-N-(2-hydroxyethyl)aminophenol as developer substance and a piperazine derivative of the formula ##STR1## in which R.sub.1, R.sub.2 and R.sub.3 denotes substituents as described hereinafter capable of developing a certain quantity of film e.g. 10 roll films per liter successively to substantially constant gamma values.

REFERENCES:
patent: 2586168 (1952-02-01), Kaszuba
patent: 2948615 (1960-08-01), Dersch et al.
patent: 3232759 (1966-02-01), White et al.
patent: 3547638 (1970-12-01), Cossar et al.
Mason, Photographic Processing Chemistry 1966, pp. 20-22.

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