Process for preparing photographic solutions containing hydroqui

Details Process for preparing photographic solutions containing hydroqui Process for preparing photographic solutions containing hydroqui

1981-05-29

1982-12-28

Downey, Mary F.

Radiation imagery chemistry: process, composition, or product th

Nonradiation sensitive image processing compositions or...

Developer

430399, 430441, 260512R, G03C 530

Patent

active

043662340

ABSTRACT:
Photographic solutions containing hydroquinone monosulphonate are prepared by a process comprising forming hydroquinone monosulphonate by reacting in solution hydroquinone, a salt of sulphurous acid and hydrogen peroxide. The reaction may be effected in the presence of one or more chemicals required for a photographic developer or after the formation of hydroquinone monosulphonate such material may be added. The invention is useful for making sodium or potassium hydroquinone monosulphonate and may be used in the preparation of a first developer for processing color reversal film, such as by the Kodak E6 process.

REFERENCES:
patent: 3580956 (1971-05-01), Bloch
patent: 4046571 (1977-09-01), Mertz
L. F. A. Mason, Photographic Processing Chemistry, Focal Press 1966, pp. 35 and 74.
Kirk-Othmer, vol. 15, pp. 371-374.
J. Amer. Chem. Society, James et al., "Oxidation Processes XIII, The Inhibitory Action of Sulfite and Other Compounds in the Autoxidation of Hydroquinone and Its Homologs", vol. 61, pp. 442-450, 1939.
Mason, Photographic Chemistry, 1966, pp. 29-44.

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