The quantitative determination of hypo in photographic prints with silver nitrate

✍ Scribed by J.I. Crabtree; G.T. Eaton; L.E. Muehler

• Publisher: Elsevier Science
• Year: 1943
• Tongue: English
• Weight: 571 KB
• Volume: 235
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(43)90420-x

✦ Synopsis

A silver nitrate test is described for the quantitative determination of residual hypo in photographic prints.

The hypo is converted in situ to silver sulfide, the transmission density of the sulfide determined, and the hypo content obtained by reference to a standard curve.

The method used to establish the standard curve is outlined, the data being verified by quantitative analyses. A simplified procedure is suggested involving the application of a drop of silver nitrate to the back of the print and then matching the spot visually with a set of standards.

* Kodak Research Laboratories, Rochester, N. Y. t There are many references to the use of silver nitrate; the pertinent ones are given later.

3. 51

* Potassium bromide has been used by the authors for this purpose but