An important note regarding old and new emulsion types has been bothering me regarding the evolution of the Rodinal developers and several other formulations.
Old style emulsions were washed to a given conductivity, and this was done after the treatment with sulfur. Later emulsions were still washed to a given conductivity, but some had sulfur + gold added, the sulfur being in the form of thiocyanate.
Modern formulas are untreated with sulfur, washed to a given vAg, treated to balance the final salt content at a fixed figure, and then sulfur + gold finished in a manner in which the sulfur may be in the form of some quite exotic compounds. They are then surface treated for spectral sensitivity with some dyes quite different than those used 50 years ago and are treated with agents to preserve the emulsion that are quite different than the early chemistry.
So, today's emulsions are vastly different in precipitation but also in workup prior to coating, and in such a way that the silver solubility is quite different.
Just some thoughts from someone who has worked on each side of the silver curtain.