A kinetic infrared scanning densitometer was used to study lithographic development in real-time. The instrument proved very effective after several slight improvements to increase sensitivity and obtain Density vs Time of Development curves directly- It was noted that this apparatus could also be used lot a study of the penetration of solutions into an emulsion. An exposure series on a normal Kodalith system indicates a decrease in induction time and an increase in maximum rate (up to diffusion limit) with increasing exposure. A series of sulfite concentrations shows that the lith effect becomes detectable only below a sulfite concentration of approximately 8 g/l in this system. A low sulfite developer with no formaldehyde showed that D max was highly dependent on exposure and developer exhaustion. Complete elimination of formaldehyde from the lith developer caused some unexplained effects.

Library of Congress Subject Headings

Photography--Developing and developers; Photographic sensitometry

Publication Date


Document Type

Senior Project

Student Type


Department, Program, or Center

School of Photographic Arts and Sciences (CIAS)


Carroll, B. H.


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