yes, of course, they all state that is not advisable remelting and they all suggest to break the emulsion in smaller quantities. But I never did that. And I know people who don't do that either.

Anyway, I just got an idea.
Why not making separate stock solutions of potassium bromide and silver nitrate? The Silver nitrate keeps very well inside a dark glass bottle. But how about potassium bromide in a gelatin solution, perhaps with some antiseptic additive?

Everytime one needs some emulsion, the potassium bromide solution could be melted at a given temperature, and then some warm solution of silver nitrate could be mixed in for immediate use. If this is possible, it would shorten the emulsion making time.

What do you think?