A method for increasing color-fastness of organic coloring matters against light is disclosed, the color-fastness of the organic coloring matter of which absoption maximum is the region from 400nm to 700nm is increased by coexisting with a metal complex represented by the following general formula:
in which R1, R2, R1' and R2' are a hydrogen atom or a substituent, X and X' are O or S, Y is O, S, SO or SO2 and M is a metal atom.
The method adapts to improve the fastness of color images of silver halide photographic materials. In this case, the organic coloring matter is a dyestuff formed by coupling a color forming coupler with an oxidation product of a color developing agent in the silver halide color photographic material or a dyestuff diffused to a recieving layer of the diffusion transfer silver halide color photographic material.
本发明公开了一种提高有机
着色剂耐光色牢度的方法,通过与由以下通式表示的
金属络合物共存,提高了吸收最大值为 400nm 至 700nm 区域的有机
着色剂的色牢度:
其中 R1、R2、R1'和 R2'是氢原子或取代基,X 和 X'是 O 或 S,Y 是 O、S、SO 或 SO2,M 是
金属原子。
该方法适用于提高卤化
银感光材料的彩色图像牢度。在这种情况下,有机着色物质是通过将显色耦合剂与卤化
银彩色感光材料中
显色剂的氧化产物耦合而形成的
染料,或者是扩散到扩散转移卤化
银彩色感光材料接收层的
染料。