I was answering your post #34 relating to other things involved in imaging or imaging qulaity.
I am quite aware of all of the methods of making images other than Silver Halide. More than you might imagine. I was merely pointing out that of all of these methods, Silver Halide offers the most advantages when compared to these others.
You seemed to have missed the point.
Theo OP asked about alternative EMULSIONS, and you have not addressed that point, as Cyanotype is not an emulsion. I did address it in my post about Copper imaging. It is a true photographic emulsion.