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1 790 304

(13)

A1

(51)

IPC

(21) (22)

Application

4868905/04, 1990-09-25

(22)

Actual filing date

1990-09-25

(45)

Published

1997-06-20

(72)

Inventor

Zhurba Ju.I.Dratinskaja V.I.Ashmanova M.Ju.

METHOD OF PRODUCING REVERSED BLACK-AND-WHITE IMAGE Russian patent published in 1997 - IPC

Abstract SU 1790304 A1

FIELD: photographic processes and materials. SUBSTANCE: method of producing black-and-white image consists in development, bleaching, exposition, clarification, and processing in blackening solution containing (in g/l): tin dichloride, 1-15; hydroquinone, 1-10, or metol, 1-6, or methylphenidone, 0.1-3.0; alkali reagent, 5-50; sodium sulfite, 20- 60; and water to 1 l. Stability of blackening solution increases over the period up to 5 days with retaining sensitometric properties of image. EFFECT: improved stability of blackening solution. 1 tbl

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SU 1 790 304 A1

Authors

Zhurba Ju.I.

Dratinskaja V.I.

Ashmanova M.Ju.

Dates

1997-06-20—Published

1990-09-25—Filed

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