Effect of Aeration on the Photographic Properties of Developers

The object of this investigation was to ascertain the feasibility of using air as a means of agitating developing solutions by determining the effect of bubbling air through various commercially used developers on their photographic properties. — Unseasoned elon-hydroquinone developers of relatively high alkalinity (pH 10.0 to 10.5) showed a rapid decrease in activity after aeration for 1 1/2 hours while elon-hydroquinone-borax developers of low alkalinity (pH 8.4 to 8.8) showed increased activity (due to the liberation of alkali resulting from oxidation) which then remained constant for prolonged periods. — In general, the alkalinity of developers containing hydroquinone increased on aeration, while those containing only elon showed little change. — Practical tests with processing machines equipped with air agitation devices have shown that very constant developing conditions can be maintained when suitably replenished.

Print ISSN

0097-5834

Published

1940-04

Content type

Original Research

DOI

10.5594/J14629