III International Conference

THE PROCESSES OF POLYCHROMATIC IMAGING ON THE BASE OFPP-I-9COLLOIDAL SILVER PARTICLES IN THE AgHAL PHOTOSENSITIVE LAYERSBranitsky G.A., Sergeyeva O.V.Byelorussian State University, Minsk, Republic of BelarusE-mail: o_sergeeva@yahoo.comCondensation, dispergation and combined methods to obtain the colloidal silver particleswith the purposeful regulated optical properties were realized. This allowed to form thepolychromatic (multicolored) image in the black-and-white AgHal-layer without the use oforganic dyes and colored pigments.The results of the investigations carried out with the participation of V.D.Stashonok andV.V.Sviridov and used to create the new, earlier unknown photographic processes, called thepolychromatic ones, are discussed.Polychromatic image (PI) is formed on the black-and-white AgHal photographic layer.Unlike the common color image it doesn’t contain the dyes and colored pigments. Unlike theblack-and-white image, which consists of filamentary silver particles, absorbing the visiblelight in all spectral region, PI consists of colloidal silver particles. These particles scatter andabsorb the light selectively in dependence on their size and shape on the different parts of theimage. As the result the object of photography is represented in the symbolic colors.PI can be obtained by condensation (1), dispergation (2) and combined (3) methods. Themethods (1) are based on the catalytic reactions, in which the latent image centers (LIC)formed in the photographic layer under the light exposition enlarge their size at the expense ofthe reduction of Ag + ions, coming from the AgHal microcrystal lattice to the swelled gelatinelayer during it’s treatment in the solution, which contains the AgHal solvent (KCNS) andreducer (methol, phenidone, hydroquinone). The difference of formed colloidal silverparticles in their size (from 25-40 to 300-350 nm) is achieved as a result of the difference inthe rate of silver ions reduction on the photolayer parts with the various LIC number,determined by the exposure magnitude.The methods (2) are based on the destruction of filamentary silver structure of the blackand-whiteimage in the unusual solution, containing the strong oxidizer (K 3 [Fe(CN) 6 ]) andreducer (NaBH 4 ) simultaneously. In the alkaline medium their interaction is slowed downkinetically. The silver catalyzes this reaction with the formation of intermediate compounds,which then are destroyed in water. The nanosized silver particles (1-10 nm in diameter) are23