→Ferric Ammonium Oxalate
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 three Holoforum threads:
holoforum.org/forum/viewtopic.php?f=7&t=440 , http:// holoforum.org/forum/viewtopic.php?f=7&t=497 ,http:// holoforum.org/oldforum/viewtopic.php?f=2&t=6553 .
Test plates were fabricated using: