Just converting from conductivity to vAg will change the excess halide available to diffuse into the developer at the start of the process. Using an organic antifoggant or antioxidant instead of Sodium Sulfite in an overcoat will change emulsion properties and use of Thiosulfate as sensitizer instead of Thiocyanate will change the properties.
Modern sensitizing dyes are quite different than the early dyes and we both know that. Examples are modern cyanines and merocyanines and earlier ones include many ortho dyes instead of pan dyes. Erythrosine comes to mind here.
So, I'm sure with some thought, we all could come up with a long long list of simple differences that are quite well known having been posted here before and posted elsewhere.
But how much effect would these ancillary compounds really have on the development of films? And in what ways?
Re Conductivity vs VAg...
For the most part, arn't they both aimed at getting one to the same point?
I thought conductivity was used to estimate the degree of washing...
and infered a certain desired the pX from that.
I had the idea that VAg was just a more accurate measure....
and that the desired point would be the same despite which method was used to get there.
For the triphenylmethane dyes, etc., yes I agree.
Somehow I thought you were thinking of something newer.
Firstoff, one never measures pX. You cannot infer much of anything from it. You need vAg or pAg to measure the free Silver ion present as it is the critical item and varies with halide. Conductivity is not a measure of either when you get down to it.
As for dyes, sure I can throw in an Osmate dye complex just for fun.
and while pAg is of interest, is it not the AgX solublity that is really the important consideration when conductivty is being measured, ie just prior to CD?
If so, then the halide concentration should be of interest... in anycase you are right, conductivity is not really a measure of either pAg or pX,
but... they both change with progressive wash efectivness and therefore their former? usefulness as a guide.
Re the extra fun Osmate dye complex...
On no, lets wait a while!
I don't want to over dose!
Ray - if you've been following along for the last couple years, you would have remembered that pX is useless when there is a mixture of halides in the system. What does that number tell you when there's a mixture?
Thus, pAg is measured instead.