What what its worth, the following are some of the more interesting I've found so far. The addition of ammonium nitrate is alleged to improve sensitivity, but I'm not sure what the other two are supposed to accomplish. Has anyone tried any of these? I've just begun playing with adding ammonium nitrate to KDi. Initial results are encouraging, but I have to work through many of my own DCG process issues.
3.6-30-467 plus Chromium Acetate, Ethanol
Markova, Nazarova, and Sharlandjlev, “Control of the Spectral Position of DCG Reflection Holograms,” Institute of Optical Materials and Technology.
- 64.3 g gelatin, Bloom strength of 210
- 7.71 g ammonium dichromate
- 0.64 g chromium acetate
- 65 ml C2H5OH (ethanol)
- Distilled water to make 1000 ml
5-30-200 plus Ammonium Nitrate
Bahuguna, Beaulieu, and Arteaga, “Reflection display holograms on dichromated gelatin,” Applied Optics, volume 31, issue 29 (1992).
- 2.5 g of ammonium dichromate
- 1.5 g of ammonium nitrate
- 100 cc of distilled water
- Heated to 70°C
- 15 gm of USP grade Baker's gelatin (125 bloom strength) powder slowly added while stirring
Sensitivity was reported as 100 mJ/cm2 at 488 nm.
4.5-30-500 plus Ammonia
Coblijn, Alexander B., "Theoretical background and practical processing techniques for art and technical work in dichromated gelatin holography", SPIE Institute Series Vol. IS 8 (1990).
- 100g water
- 6g gelatin
- 0.9g ammonium dichromate
- 2ml ammonia 35% (added last)