I got this idea from the autochrome thread at hybridphoto. As you know autochromes have cool colors and as Philip suggested to me that I needed to print with inkjets and the autochrome dyes on to the transpartent film to get closer look to autochrome. But he said I needed to print a bw layer also.
This idea opened new doors. If we want autochrome colors , we need bw and color together.
So bw and color film emulsions can be put in to the same film by a manufacturer.
We scan the film with selective scanning and get bw or color or together.
Or they can adjust the powers of these layers and we print bw and color together with an enlarger.
I dont know scanners are legal at apug.