Quote Originally Posted by dwross View Post
Unfortunately, this is the kind of topic that so often turns acrimonious here. There was a thread not too long ago that asserted ammonium bromide was a "crutch". Could never figure out why (except maybe because it works so well in an emulsion??) Anyway, no substantiation to the claim. Just an assertion.

Jason, perhaps the best way for you to answer the question is to try different bromides. You know where to find a proven ammonium recipe . http://thelightfarm.com/cgi-bin/html...tent=15Jun2013.

I, in turn, will refrain from speculation on sodium bromide, as I haven't yet tried it. It's the real paradox of these kinds of discussions. It is natural to want to speculate, but it really serves no purpose. So, you are left with people who have actual experience, and in our case, there aren't that many emulsion makers yet. There wouldn't be much of a discussion among the few of us, but we can hope and encourage others to take the plunge.

Here we go again. The effects of ammonium ions in an emulsion have been documented, and discussed ad-nauseum here. Ammonium is a silver solvent, and as such changes the growth rate and morphology of halide crystal. The use of ammonium is a short-cut method compared to controlled crystal growth. That being said, it's probably quite sufficient for most home-brew emulsions.

Should you want to explore the role of different halide salts in the precipitation, solubility and effects upon vAg will be revealing. That route is however a 'technical' approach - some prefer the "just because" explanation.

I would be pleased to provide further detail off-list.