Edwal makes fine products, but Hypo-Check indicates premature exhaustion with Sprint™ RECORD Speed Fixer. Instead, try our fixer test. Put a piece of undeveloped film in a small beaker of fixer working solution (1:9) and stir. If the film’s emulsion does not clear, that indicates the fixer has worked to capacity, and will no longer be effective in removing silver from the film. A new batch of fixer working solution should be made.
Permanent link to this article: http://sprintsystems.com/how-do-i-check-to-see-if-my-fixer-is-exhausted-if-i-cant-use-hypo-check/