Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Thiourea photographic fixer

Sulfur Complexes. Silver compounds other than sulfide dissolve in excess thiosulfate. Stable silver complexes are also formed with thiourea. Except for the cyanide complexes, these sulfur complexes of silver are the most stable. In photography, solutions of sodium or ammonium thiosulfate fixers are used to solubilize silver hahdes present in processed photographic emulsions. When insoluble silver thiosulfate is dissolved in excess thiosulfate, various silver complexes form. At low thiosulfate concentrations, the principal silver species is Ag2(S203) 2j high thiosulfate concentrations, species such as Ag2(S203) 3 are present. Silver sulfide dissolves in alkaline sulfide solutions to form complex ions such as Ag(S 2 Ag(HS) 4. These ions are... [Pg.90]

See other pages where Thiourea photographic fixer is mentioned: [Pg.234]    [Pg.7219]    [Pg.176]    [Pg.90]   
See also in sourсe #XX -- [ Pg.100 ]

See also in sourсe #XX -- [ Pg.100 ]

See also in sourсe #XX -- [ Pg.6 , Pg.100 ]



SEARCH



Fixers

© 2024 chempedia.info