DISPERSED BLACK COLLOIDAL SILVER, MANUFACTURE OF BLACK COLLOIDAL SILVER AND SILVER HALIDE COLOR PHOTOGRAPHIC SENSITIVE MATERIAL USING BLACK COLLOIDAL SILVER

摘要

PROBLEM TO BE SOLVED: To provide the silver halide color photographic sensitive material having sufficient density capable of reading optical information exposed from a reverse side after development processing without deterioration of sharpness and improved in infrared detection performance of a development processing apparatus by using the dispersed black colloidal silver specified in spectral absorption density in a specified wavelength.;SOLUTION: The dispersed black colloidal silver has a ratio of a spectral absorption density in 950 nm to that in 650 nm is ≥0.70, and a ratio of a spectral absorption density (Da) of an absorption maximum in the wavelength region of 350-450 nm to a spectral absorption density (D.650) (Da/D.650) is ≥1.3. A colloidal silver molar absorption coefficient εAg (950) is ≥350, where εAg (950)=D/f, D is a spectral absorption density in 950 nm, and f is a silver coating amount per unit area (mol/m2).;COPYRIGHT: (C)2000,JPO