David / Don, I've got my ei down pretty good, but I shoot a lot in low light and sometimes end up with problem negatives.

I note that The Darkroom Cookbook mentions silver intesification of the negative having a noticable effect on low values, and wonder whether that would push them further up the curve. Does anyone have experience with it?

Formulary sells a version:

http://www.photoformulary.com/Deskto...ion=0&langId=0