The camera is unfortuantely far kinder to it than reality. This is also not my "first" DCG, its probably around number 20. But its the first one which didn't look completely horrible. This is based pretty much entirely on reading old holography forum posts...
So the specifics:
Knox gelatin, 12g per 100ml of water, coated by holding the plate horizontal, pouring a puddle in the middle, and then tilting it around to the corners, then running the extra off one corner. Then drying horizontally.
Senstized dip-and-dunk style with a 1% solution of potassium dichromate.
Exposed about 13 milliJ/cm^2 with 457nm light, Denisyuk.
"fixed" in 0.6 percent potassium alum, 1 percent potassium metabisulfate.
swelling bath 26C for 5 minutes.
Dried in 70%, 91%, 99% IPA for 2 minutes each, at 30C.
My current primary issue is the dreaded milkiness. The most interesting observation I have right now is that when a hologram is very milky, the pseudoscopic image is frequently pretty good. So the milkiness is between the viable fringes and the plate...