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本文用超高压电子显微镜直接观察厚度约为2μ的一步摄影正片膜的银颗粒结构与分布。在有调色剂存在的情况下,能清楚地观察到正片膜上微小的银质点成簇的现象。这证实了调色剂具有诱发银质点快速生成及聚集成银质点簇(即银颗粒)的作用。同时还直接观察了不同物理显影核的正片膜、不同密度的正片膜及同一密度不同覆盖力的正片膜等的银颗粒结构与分布,探明它们与色调、覆盖力等的关系。
In this paper, the structure and distribution of silver particles in a one-step photographic film with a thickness of about 2μ were directly observed with an EHV electron microscope. In the presence of toner, the phenomenon of fine silver dots clustering on the positive film was clearly observed. This confirms that the toner has the effect of inducing rapid generation of silver dots and aggregation into silver particle clusters (ie, silver particles). At the same time, the direct observation of the structure and distribution of positive particles of different physical development nuclei, positive densities of different densities, positive films of different densities with the same density and the like, and also the relationship between the silver particles and their hue,