Granulated photographic fixative and its preparation
AssigneeAgfa-Gevaert
InventorPeter Kuhnert
Life of this patent
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Abstract
A granulated photographic fixative or bleach fixative composed of grains containing both a thiosulphate and a disulphite is mechanically stable, dust free and freely pourable, will keep indefinitely and is distinguished by its great speed of solution.
Claims5
Granulated photographic fixing or bleach fixing agent, the granulates having an average particle diameter of from 150 to 3000 .mu.m and containing both a thiosulfate and a disulphite.
A process for the preparation of a photographic fixative or bleach fixative in granulated form containing a thiosulphate, characterised in that the thiosulphate is milled together with a disulphite and optionally other solid substances so that the particle diameter distribution curve has its maximum below 10 .mu.m, the milled particles are subjected to a powder agglomeration, and the granulate is dried under vacuum, optionally mixed with the granulate of bleaching agent and packaged in a damp proof package.
Dependencies are inferred from the claim text.