Further processing Photographic processing

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black , white emulsions both negative , positive, may further processed. image silver may reacted elements such selenium or sulphur increase image permanence , aesthetic reasons. process known toning.


in selenium toning, image silver changed silver selenide; in sepia toning, image converted silver sulphide. these chemicals more resistant atmospheric oxidising agents silver.


if colour negative film processed in conventional black , white developer, , fixed , bleached bath containing hydrochloric acid , potassium dichromate solution, resultant film, once exposed light, can redeveloped in colour developer produce unusual pastel colour effect.







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