| Residual fixer on processed films over time can turn films brown. This browning deteriorates the image, making the films useless for comparison. To monitor the amount of residual fixer, the Fixer Retention Test Kit 166B contains residual hypo test solution and a hypo estimator test strip. A drop of solution is placed on the emulsion side of a freshly processed film. After waiting two minutes, the area where the solution has dried is compared to the hypo estimator. Residual hypo in the film should be 0.02 grams per square meter. |
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| 166B |
Fixer Retention Test Kit |
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