Hologram 189.1
Posted: Sat Jun 06, 2020 6:34 pm
This is my best one sofar. The picture was taken in my yard in sunlight. It is a bit yellower in real life.
20% 250 bloom gelatin
mold coated with scotch tape shims (2 mils)
dried about 5 days (mostly because I had to go to work...)
sensitized for 1 minute in a 3% solution of K dichromate, rinsed in 1/2 % K dichromate to avoid crystallization.
dried overnight, it was about 12 hours old when exposed.
exposed for 200 seconds, to 100 uW/cm^2 457nm light
So about 14 millijoules/cm^2 (angled at 45 degrees)
washed for 1 minute in distilled water (picked up lots of dichromate)
fixed for 30 seconds in 1 % K metabisulfate, no hardener
swelled in distilled water at 24C for 5 minutes
2 minutes in 70% IPA (24C)
2 minutes in 91% IPA (26C)
2 minutes in 99% IPA (26C)
dried with a heat gun, till too hot to hold
The wash before the fixer seems to make everything much happier.