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Reversal Prints Revisited 5 лет назад


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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:    • Direct Positive Reversal Prints On Re...   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-h... 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

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