Powdered packaged developer
AssigneeE. I. Du Pont de Nemours and Company
InventorsDaniel R. Fruge, Peter K. Sysak
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Abstract
A storage stable and rapid dissolving packaged powder developer of uniform composition is produced by preparing developer or developer precursor solutions and removing solvent to provide powder for packaging in plastic impervious to the atmosphere. Preferably, the solvent is removed by freeze-drying or spray-drying.
Claims2
A powder suitable for the preparation of a liquid photographic developer upon the addition of water consisting essentially of (a) particles of at least one of hydroquinone or chlorohydroquinone, either alone or in combination with a solid secondary developer, at least one antifoggant, or both, said particles having an average particle size less than about 100 microns;
- and (b) particles of a solid alkali other than hydroxide having an average particle size less than about 100 microns, said mixture dissolving in enough water to make a working strength developing solution in less than about 15 minutes.
Dependencies are inferred from the claim text.