Additive for inhibitor removing bath

#The present invention relates to photographic color development technology, and more particularly relates to a color reversal monobath and a process for its use, and to photographic kits adapted to prepare such monobaths.

#A widely used process for reversal color development of silver halide photographic films employs a succession of baths through which exposed photographic films must be passed. For example, a first bath may include a black and white developing agent which reduces silver halide in latent image areas of a film to silver, forming negative silver image therein. Thereafter the film may be uniformly exposed to light to form fog centers in undeveloped areas of the film, and then treated with a color developer solution in which a color developing agent reduces silver halide in the fogged areas to silver, and is itself oxidized. The oxidation product of the developer reacts with one or more color couplers which may be distributed throughout various layers of the film to form dyes therein. The silver images may then be bleached from the film, and unreacted silver halide may be removed therefrom by "fixing" to thus provide positive, colored images. To avoid cross-contamination of the various processing baths, a number of intermediate wash baths are commonly employed. Further, a "stop" bath is ordinarily utilized to halt black and white developement immediately after treatment of the film in the black and white developer bath.

#As will be evident from the above description, the process described employs many steps and utilizes many different processing baths. In addition, the shelf-life of these prepared solutions is poor. Further, the above procedure must be very carefully regulated in order to provide satisfactory photographic color reproductions. Moreover, the time which is required to fully process an exposed roll of color film (a major cost factor) is inordinately long. A faster, more efficient, lessdetailed positive color development process is hence much to be desired.

#Single dose pellets for use in the practice of the practice of the invention were made as follows:

#0.3 g magnesium stearate, 2.0 g corn starch, 3.0 g potassium borohydride, and 94.7 g of lactose were added into a dry powder blender. The powder mixture was tumbled well until the materials were evenly mixed (about 15 minutes).

#The powder was then added into the feed chamber of a standard pharmaceutical tablet maker. The tablet maker settings were adjusted so that 200 mg of powder were used for each tablet. The powder was compacted into a pellet which provided 6.0 mg of borohydride, an amount quite satisfactory for use in 100 ml inhibitor removing bath.