Abstract: The present invention relates to the use of 4-aza-1-azoniabicyclo(2.2.2)octane salts as charge control agents for an electrostatic toner contained in dry electrographic developer compositions. These charge control agents preferably have the formula ##STR1## wherein R is an aliphatic organic group having from 4 to about 30 carbon atoms, and X is an anion.

Abstract: An activator-stabilizer precursor compound having an acid portion which is an alpha-sulfonylacetate is useful in a photographic composition which is responsive to heat for processing. The activator-stabilizer precursors are characterized in that their acid byproducts have reduced toxicity and volatility and are substantially inert in a processed photographic element.

Abstract: Ammonium mercaptoalkanesulfonate salts having the formula: HS--R--SO.sub.3 .sup.-NH.sub.4 .sup.+ are new salts prepared by a novel process comprising reaction of a thioamide, such as a thioalkanamide or thioarylamide, with a sultone in alcohol. Typical examples comprise reacting thioacetamide with 1,3-propane sultone (for ammonium 3-mercaptopropanesulfonate); with 2,4-butane sultone (for ammonium 3-mercapto-1-methylpropanesulfonate); and with 1,4-butane sultone (for ammonium 4-mercapto-2-butanesulfonate.) The product can be recovered by precipitation with a nonsolvent for the product such as ether, benzene, or ligroine, followed by filtration. The new ammonium salts in aqueous solution are useful as silver complexing agents for photographic fixing or stabilizing, and are more active than the known alkali metal and guanidinium salts, thus providing a new method of fixing developed silver halide photographic elements.