Copper physical development of copper latent images was researched. The proposed method for producing copper latent images was to soak a titanium dioxide in a copper (II) sulfate nucleating bath and expose to UV radiation below 4l0nm. The exposures were to produce the copper latent image. Three physical developers were used to try to intensify the latent images. The developers utilize an iron (II)/iron (III) redox system to reduce copper (II) sulfate to copper metal. The developers also contain carboxylic acids as complexing agents for iron (III) ions and cationic surfactants for stability. The printout achieved was not stable and shown not to be copper metal. A copper colloid emulsion was prepared. The three physical developers bleached the copper colloid. A physical developer using formaldehyde as a reducing agent was prepared. The developer produced a brown to purple color change on the copper colloid emulsions.
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Department, Program, or Center
School of Photographic Arts and Sciences (CIAS)
Tashker, Gregg and Schreiber, Peter, "Copper Physical Development of Copper Latent Images" (1977). Thesis. Rochester Institute of Technology. Accessed from
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