Abstract

The heteropolytungstic acids, especially certain of the phosphotungstic and silicotungstic acids, are photooxidizing agents with properties that suggest their use in photographic processes. The chemical and physical properties of the substances are described, and simple demonstrations of three new photographic processes based upon phosphotungstic acid are outlined. These comprise a printing out process producing images in pigments of basic dyes; phototropic, and therefore reusable, printing out materials; and the development of a latent image.

© 1954 Optical Society of America

Preparation of Plates of Boric Acid Glass for Use in the Study of Luminescence*

Frank E. E. Germann, Garth L. Lee, Frank T. Brown, and Lloyd M. Guthrie
J. Opt. Soc. Am. 44(6) 496-498 (1954)

Measurement of the Roughness of the Sea Surface from Photographs of the Sun’s Glitter

Charles Cox and Walter Munk
J. Opt. Soc. Am. 44(11) 838-850 (1954)

Estimation of the Critical τ Period in Latent-Image Formation by Intermittent Exposures*

R. E. Maerker
J. Opt. Soc. Am. 44(8) 625-629 (1954)

Note on Gloss Measurement and Tolerance of Photographic Paper

Berthold Brenner
J. Opt. Soc. Am. 44(6) 494-496 (1954)

Modification of the Carbon Arc Searchlight for Producing Experimental Flashburns*

Thomas P. Davis, Leo J. Krolak, Robert M. Blakney, and Herman E. Pearse
J. Opt. Soc. Am. 44(10) 766-769 (1954)