彩色感光材料冲洗中隐青的产生及解决办法

Formation of Cyan Leuco-dye in Color Photographic Materials Processing and Methods of its Prevention

在彩色感光材料冲洗过程中,经过彩色显影液处理的感光药膜中,同时生成黄、品红、青三种颜色的染料,但实际上由于青染料隐色体的电位比黄和品红染料隐色体的电位高,醌二亚胺阳离子没有足够的能力将其氧化,因此在彩色显影液中生成的是青染料的隐色体,只有在进入漂白液以后,才能形成真正的青色染料,如果由于某种原因,使得这种转变不能全部完成,就会有一部分青染料的隐色体存留在影像的青色部分,形成隐青,直接影响彩色影像的质量。本文系统地阐述了隐青的危害、产生的原因和解决的办法。

During the chemical processing of color photographic materials, simultaneously three dyes, i.e. yellow, magenta and cyan, are formed in the respective photosensitive layers treated with the color developer; but owing to the fact that the electrode potential of the cyan dye leuco-derivative is much higher than those of the yellow and magenta dyes, thus cannot be oxidized by quinone diimine, consequently only the cyan dye leuco-derivative is actually formed during the color development and should be transformed into the cyan dye in the bleaching bath. Any untransformed cyan leuco-dye remained in the cyan image of the final color image will directly damage the color image quality. This paper elucidated the harmful effects of the cyan leuco-dye, the causes of its formation and methods of its prevention.