Abstract
A visible gold image, consisting of roughly spherical particles varying in size up to 80 mμ in radius for the longest times of treatment, was obtained by bathing exposed photographic film in an aurous gold solution. The particles are formed by a “physical development” of the latent-image specks. Electron micrographs show that they are situated at the surface of the silver halide grains. The gold treatment increases the emulsion speed and the rate of direct development and decreases, but does not eliminate, the induction period in sulfite-free hydroquinone or p-hydroxyphenylglycine developers. The gold treatment does not change the relative dependence of the rate of development upon the hydroquinone concentration. The relatively small decrease which the gold treatment effects in the induction period is not in accord with Bagdasar'yan's mechanism of development or with electrode mechanisms which seek to explain the induction period on the basis of size and capacity of the development centers.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
