Yellow dye-containing developing composition and its use in two-

Details Yellow dye-containing developing composition and its use in two- Yellow dye-containing developing composition and its use in two-

1999-03-02

2000-03-07

Le, Hoa Van

Radiation imagery chemistry: process, composition, or product th

Nonradiation sensitive image processing compositions or...

Developer

430486, G03C 5305

Patent

active

060338385

ABSTRACT:
Black-and-white elements, such as radiographic films, can be processed in roomlight because the developing composition includes a water-soluble colorant. Such colorants are water-soluble dyes that have a maximum absorption wavelength of from about 350 to about 500 nm. Processing is carried out by processing the exposed element using a two-stage process in the same processing container. In the first stage, development is initiated with an opaque developing composition having a pH of from about 10 to about 12.5, and comprising an appropriate black-and-white developing agent, a yellow colorant, and a sulfite. After an appropriate time, a fixing agent (other than a sulfite) is introduced into the processing container to begin simultaneous development and fixing. The entire process in quite rapid, that is less than 90 seconds.

REFERENCES:
patent: 3630744 (1971-12-01), Thiers et al.
patent: 4216285 (1980-08-01), Miller
patent: 4803150 (1989-02-01), Dickerson et al.
patent: 4954425 (1990-09-01), Iwano
patent: 5296342 (1994-03-01), Roefs
patent: 5871890 (1999-02-01), Fitterman et al.

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