摘要:
WHEREIN R is a lower alkyl radical having from one to five carbon atoms, inhibits the formation of the white precipitate characteristically produced when sequestrants of this type are used to sequester ions of heavy metals such as calcium. Alkali metal, ammonium and ethanolamine salts of compounds of the above formula and mono and dialkyl esters thereof with methanol, ethanol, propanol and butanol also provide useful sequestering agents.
The incorporation of small amounts of lithium ion into a solution of a heavy metal sequestering agent of the formula:
摘要:
PHOTOGRAPHIC COMPOSITIONS AND ELEMENTS COMPRISING A ZWITTERIONIC COMPOUND AND AN ANIONIC COMPOUND. IN ONE ASPECT, THIS INVENTION RELATES TO A PROCESS COMPRISING DEVELOPING A PHOTOGRAPHIC IMAGE IN THE PRESENCE OF A ZWITTERIONIC COMPOUNDAND AN ANIONIC COMPOUND. IN ANOTHER ASPCT, THIS INVENTION RELATES TO A PHOTOGRAPHIC DEVELOPER COMPOSITION COMPRISING A PHOTOGRAPHIC DEVELOPING AGENT, A SWITTERIONIC COMPOUND, AND AN ANIONIC COMPOUND.
摘要:
A one-part photographic developing concentrate comprising: (i) a paraphenylene diamine color developing agent; and (ii) a water-soluble organic solvent, wherein a molar ratio of sodium ion to potassium ion is at least 3, and a molar ratio of sulfate ion to carbonate ion is at least 0.25.
摘要:
An aqueous developer solution for use in digital film processing. The developer solution includes a developing agent and at least one surfactant or thickener. A method of processing a photographic film is also provided, and includes the steps of coating an aqueous developer solution containing at least one surfactant or thickener onto the film, thereby developing the film, and scanning the film through the coating of developer solution.
摘要:
Concentrated and working strength photographic color developing compositions are stabilized with the inclusion of two specific types of calcium ion sequestering agents. One of the sequestering agents is a polyelectrolyte such as a polycarboxylic acid or salt thereof having a molecular weight of from about 2000 to about 100,000. The other one is a non-polymeric aminocarboxylic acid, polyphosphonic acid, or a salt thereof. The weight ratio of the first calcium ion sequestering agent to the second calcium ion sequestering agent is from about 1:1 to about 20:1. These compositions can be used to process color photographic materials such as color photographic papers.