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So your water temperature seems to be too high. With my standard FEG gelatin I usually can't go higher than 30C. Note also that when you insert your plate into the water right after the H2O2 step the gelatin becomes very vulnerable to damage. To prevent that you might use COLD water (<20C) to remov...

A bit confused. Couldn't get a reflective hologram but did copy a transmission one with 405nm laser (the master was made with red laser on litiholo film, i just placed the film on FAC emulsion plate under beam to get direct transmission copy). Perhaps i did something wrong as i see only small part o...

Didn't get any hologram with 4% FAC emulsion with my 405nm and 450nm lasers. Only semi-transparent reflections of coins in the gelatine, with white milky layer at lower exposures and transparent on higher. Not sure if that is right method, but i've examined plates with strong magnifying glass and fo...

Congratulations! That looks very promising. The white color of the dry layer seems to indicate some layer damage. Maybe the water was simply too warm? I'd skip the potassium aluminium sulfate step. Without fixer a lot of emulsion gets washed off in water. And wasn't able to get something near that ...

Finally got something that looks like hologram with 5mw 405nm laser at 300..480 seconds exposure with 2x3" slides (tried also 450nm laser but couldn't get anything useful yet, seems my adjustments for the laser wasn't enough). Got out of citric acid at previous failed runs (funny fact, it is ha...

As of now I never managed to record a hologram from a FEG layer. Meant to say at 532nm. Same, tried with safranin-o dye added, no any results with green laser (even at tens times more exposition as my UV-near laser), plate is completely empty with no polymerization (all of gelatine washed off). Wil...

I'm looking forward to learn about your tests. In my experience adding citric (or tartaric, oxalic, lactic) acid didn't enhance speed. Well, i've messed up my first batch and couldn't get samples good enough to compare them. But looks like citric acid does help a bit (not sure how much though). Wil...

Found interesting article: https://www.jstage.jst.go.jp/article/photogrst1964/68/Suppliment2/68_Suppliment2_81/_pdf/-char/en According to it, adding citric acid does help to improve sensitivity almost to dichromated gelatin level. Not sure if it will work for holography, going to try this (as my shi...