Principles of PD Recording Systems and their Use in Photofabrication

Partly presented at the Symposium on Non-Silver Photographic Processes, organized by the Royal Photographic Society, Oxford, on 30 September 1969, and at the Photographic Colloquium, organized by Prof. W. F. Berg of the Photographic Department ETH, Zurich, on 17 December 1970.

Abstract

This paper begins with a review of various methods of obtaining physically developable latent images. The more extensively discussed PD-D and PD-R systems have in common that the latent image is produced by indirect nucleation. In PD-D systems silver amalgam nuclei are formed by a disproportionation reaction during or after exposure: in PD-R systems metal nuclei, e.g., those consisting of silver, palladium, platinum or gold, are formed by reduction during or after exposure. Examples are given of the physical developers, and the factors determining stability and speed are discussed. Electroless coppering solutions are included and the effect of deposition rate and temperature on the ductility of copper deposits is considered. The influence of polyethylene glycols on the deposition rate and ductility is illustrated. PD-D photoplating based on photosensitive diazosulphonate and PD-R photoplating on Tio₂/adhesive layers and the production machines are described.

Notes

Partly presented at the Symposium on Non-Silver Photographic Processes, organized by the Royal Photographic Society, Oxford, on 30 September 1969, and at the Photographic Colloquium, organized by Prof. W. F. Berg of the Photographic Department ETH, Zurich, on 17 December 1970.