You're a hard man, Mr. Mowrey, but these days I just chuckle and move on. I'm having too much fun, and my harshest critic (me) is very satisfied with my progress.
re your workshop: You may want to reword the course description. It reads "...This is a silver bromide emulsion suitable for coating developed out printing paper or plates to be used in the camera..."
I would take that to mean students will be putting their emulsion on paper and glass (i.e. dry plate.) But if it's just emulsion making without a coating and processing component, it would probably be best to spell that out.