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| [[File:FAO_TestGrating.JPG|400px|right]][[File:FAO_TestFigure.jpg|400px|right]]
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|[[File:FAO_TestGrating.JPG|400px|right]][[File:FAO_TestFigure.jpg|400px|right]]
Ferric ammonium oxalate (FAO) and possibly ferric ammonium citrate (FAC) have possibilities as a substitute for ammonium or potassium dichromate in gelatin. Experimentation is chronicled in two Holoforum threads:
http://holoforum.org/forum/viewtopic.php?f=7&t=440 and http://holoforum.org/forum/viewtopic.php?f=7&t=497 .
The second picture is a single-beam reflection hologram take with a 25 minute exposure.
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