Bill - the formula at the start of this thread is very close to what we made in class. I looked in the handout, and as I measured out all the chemicals we used, I can tell you we made the 4x Scale of the Silver Bromoiodide VHS emulsion. It's almost exactly what's posted here - we used a bit more silver in the class - look in your class formulas handout to see how much.
Originally Posted by Photo Engineer
The other difference between here and class is we let the one from class ripen longer than 2 hours. And we used phthalated gelatin so we could do an isowash on the emulsion in class.
From the couple emulsions I've made, I'd suggest swelling the gelatin with a little water (try about 1 part water to 1 part gelatin) before adding it to bring the gelatin up to the 8% or so conc. The times I've added dry gelatin, it seems like it just takes longer to get it to dissolve into the pot than when I swelled it with a little water.