Interesting. I know that film speed is determined by the size, shape, and density of the silver halide chrystals in the emulsion, but As I'm using an albumen emulsion right now that requires sensitization by soaking in a silver nitrate solution, it isn't really possible to 'force' crystals to grow -- you just get what you get. I was hoping there may be some sort of quick 'litmus test' I don't know about I could do to get an idea of the general speed range.
I'm determining exposure times by trial and error and if I could get a better idea of the true speed (probably around a 6 but I'm just guessing) I could control my exposures better.
I'll give you suggestion a try.
I suppose if I'm going to start taking this hobby seriously I should take some time and actually learn what I'm doing.