Digital BW, The Print

Wendel White wrote:

> Peter,
> 
> Your question was - "What is 'traditional' carbon?" I was giving you that
> answer. The gelatin in which the pigments are suspended hardens where
> exposed to light, therefore making it a light sensitive medium. The
> unexposed areas are washed away and the result is an image. This is over
> simplified but you can find detailed descriptions of the process online. I
> was not trying to address whether they are the same pigment or whether the
> carbon in 'Carbon' or 'Carbro' prints has any relationship to carbon inkjet.
> As I said, I don't know.
> 
> Wendel

At least the "Carbro" doesn't have to be a carbon! pigment 
process. Professional colour photography during the depression 
was dominated by Carbro. Directly made separations (3) with one 
shot, one mirror or two mirror cameras or when the scene allowed 
it 3 takes after another.  H.I. Williams of New York was famous 
for that kind of work at that time. No carbon used for coloring :-)

Ernst