Potassium alum in the fixer serves to:
A) neutralize the alkali of the developer.
B) act as a preservative.
C) clear remaining crystals.
D) shrink and harden the emulsion.

Question

Quizplus · Accepted Answer

Potassium alum is used in photographic fixer solutions to shrink and harden the gelatin in the emulsion, making the film or photographic paper less sensitive to physical damage during processing and handling.

Potassium Alum in the Fixer Serves To