Well, I think that this thread has moved in a useful direction as well. Because, as Denise has pointed out, this may be the direction needed to prepare a modern Autochrome.

As an added point, due to the cost of Silver Nitrate, I have tried to make the process of making an emulsion as foolproof as possible so that you do not waste money. That is why I use photograde gelatin among other things, rather than food grade, as the food grade variety varies substantially all over the world. These are the little things that that others seem to consider that this approach is not really necessary, but it is there in part, to save you money. It is also there to teach you the highest level of quality. You can do anything you want.

PE