mmm by "affect the outcome" do you mean the emulsion charateristics are going to change time by time?
I'm not thinking of storing pre made gelatin only, but gelatin mixed with potassium bromide in the right amount (in a dark bottle). If this is possible and the antiseptic additive affects only speed or contrast I could live with that... A few test strips at the beginning of a printing session would allow me to calibrate.The only things I'd like to avoid are possibility of pepper grains and fogging of course.
What kind of antiseptic would you suggest? Would be a small quantity of denaturated alcohol a possible alternative to thymol?