Reversal Prints Revisited
Joe revisits the hydrogen peroxide + citric acid reversal print process he began working with over a year ago, using aged chemistry. Will he achieve consistent, repeatable results?
See the video done by Ethan (of CAMERADACTYL Cameras fame) on the citric acid / peroxide reversal process here: https://youtu.be/KZNyqqfPBbs
This alternative reversal process was developed by Ricardo Leite in conjunction with Dr. Scott Williams (of caffenol fame), see this PDF: http://www.filmlabs.org/docs/citric-hydrogen-peroxide-bleach.pdf
A quick rundown of the process:
1) Expose print paper in-camera (grade 2 RC I rate at 3 stops more than ISO 3)
2) Fully develop in fresh chemistry to completion (~2 minutes)
3) 30s water rinse
4) 30s in citric acid solution (~3 tsp to 500mL water) face down
5) 1:00 in H2O2 (I'm using 35% H2O2, but 12% also works) face down
(NOTE: drugstore H2O2 is too weak, you need at least ~12%, can be found at health food stores or beauty supply stores for hair bleaching)
6) Repeat steps 4 & 5
7) 30s water rinse
8) Flashing exposure ~5 seconds under bright white light
9) 2nd development to completion - can be done under white lights
10) Final rinse; no need to fix, should not have any residual silver halide left in emulsion
Видео Reversal Prints Revisited канала Joe Van Cleave
See the video done by Ethan (of CAMERADACTYL Cameras fame) on the citric acid / peroxide reversal process here: https://youtu.be/KZNyqqfPBbs
This alternative reversal process was developed by Ricardo Leite in conjunction with Dr. Scott Williams (of caffenol fame), see this PDF: http://www.filmlabs.org/docs/citric-hydrogen-peroxide-bleach.pdf
A quick rundown of the process:
1) Expose print paper in-camera (grade 2 RC I rate at 3 stops more than ISO 3)
2) Fully develop in fresh chemistry to completion (~2 minutes)
3) 30s water rinse
4) 30s in citric acid solution (~3 tsp to 500mL water) face down
5) 1:00 in H2O2 (I'm using 35% H2O2, but 12% also works) face down
(NOTE: drugstore H2O2 is too weak, you need at least ~12%, can be found at health food stores or beauty supply stores for hair bleaching)
6) Repeat steps 4 & 5
7) 30s water rinse
8) Flashing exposure ~5 seconds under bright white light
9) 2nd development to completion - can be done under white lights
10) Final rinse; no need to fix, should not have any residual silver halide left in emulsion
Видео Reversal Prints Revisited канала Joe Van Cleave
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