From which processing solution is silver recovery made?

• A. Developer solution
• B. Fixer solution
• C. Stop bath solution
• D. Washing solution

Answer: (B)

Silver recovery primarily occurs from the fixer solution. This is because the fixer contains unexposed silver halide crystals that are dissolved during the film development process. When the film is fixed, the unexposed silver halides are removed, contributing to the liquid waste that contains a significant amount of recoverable silver.

The process of silver recovery typically involves techniques such as electrolysis or the use of chemical precipitation to reclaim the silver from this solution. The developer solution does not contain recoverable silver because it acts on the exposed silver halide crystals to convert them into metallic silver, which gets fixed into the emulsion. The stop bath and washing solutions do not contain silver halides and are used primarily for different stages of the processing workflow. Thus, it is the fixer solution from which silver recovery is effectively made.