Abstract: Silver halide CTP(Computer-To-Plate) Plate is based on silver halide diffusion transfer principle. In this paper, the influences on the aggregation of physically developed silver were studied with high resolution SEM(Scan Electronic Microscope). The silver clusters in different exposure areas were observed clearly. The silver particles aggregated more closely in low exposure area which usually showed oleophilic. Different shapes of developed silver, such as spherical, branch like, were obtained when various complexing agents were used. The physical developing process was monitored with a set of one dimensional CCD(Charge Coupled Device). The dynamic curves were employed to explain the aggregations of the developed silver.

Key words: physical development, CTP plate, silver particle, aggregation