Olin Hunt Specialty Products Inc.

Fuji Hunt Photographic Chemicals, Inc.

Edward C Saunders

Hongzoon Kim

Malcolm S Penman

Harris Miller

Peter R Wardle

A substantially sulfur-free ammonium thiosulfate containing product can be produced by spray drying an aqueous solution containing ammonium thiosulfate and effective stabilizing amounts of both a carbonate component and a sulfite component under effective conditions to provide a substantially sulfur-free product. The carbonate component is selected from among ammonium carbonate or bicarbonate, an alkali metal carbonate or bicarbonate, or an alkaline metal carbonate or bicarbonate while the sulfite component is an ammonium sulfite or bisulfite, alkali metal sulfite or bisulfite, or an alkaline metal sulfite or bisulfite.

Process for producing an ammonium thiosulfate product

A color developer composition that maintains developer activity in all color forming layers and increases developer capacity is disclosed. The color developer composition allows use of reduced temperature, process time, replenishment rate, or concentration of developing agent without causing color imbalance. The composition employs two or more different color developing agents in combination. Each agent in a composition is selected from the group consisting of p-amino-N-dialkylanilines and the salts thereof. The composition of the present invention may be employed in conventional color developing processes without any significant change in conventional processing procedures and steps.

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Oakland, NJ, United States of America

Edward C Saunders