Charles,
Very thank you for your précisins for the pigments, It is very interesting
I am a last question
It is for the negatives sépararations color if you use photoshop ?
With the original color pictures, if you use Photoshop, the separations of the color layers is to RVB for the negatives to make CMY Carbon color or you separate the color layers with photoshop is CMYB to make the negatives for the Carbon color dand the negatives cyan is the carbon Cyan ect ... ?

Thank you

Best regards

Philippe