A bit more on this...
The author experiments with a number of different colored nacreous pigments. The color that "blooms" when the coloring matter is added is dependent on the interference-reinforced reflection color that's present in its normal state. It's amplified by the action of developed silver-halide crystals forming around the pigment.
A mixture of red, green and blue pigments will synthesize to make white light, since this is an additive system. So I believe that for a color print to be possible, the whole thing would have to be coated on a black substrate.
To anyone with silver-nitrate in their cabinet, the very initial tests described in the patent would be incredibly easy to duplicate. No emulsion required. All the author does is to add silver-nitrate and a reducing/developing agent in an aqueous solution of the pigments. The color should form immediately, and the silver % is very low. These newly formed "pigments" could actually be used all by themselves, in carbon or gum for instance.
What's really fascinating about this patent and process is the inability to really imagine what this kind of image might look like, but to be propelled by the belief that it probably looks pretty damn interesting. It just goes to show you that this cat we've been skinning; that is, making images with the interaction of different physical materials, could be skinned a thousand different ways.
It's easy to believe that every method has been tried, every technique has been devised and every mechanism exploited. Carbon, cyanotype, kallitype, silver... that's it right??
WRONG! It seems the more you look, the more you realize that there are hundreds of things that we've never seen and never even imagined. Within some of those, we might find a process that makes something truly amazing possible.