"They are prints made with carbon pigmets, plain and simple. In fact it is probably more accurate (and truthful) than the term "carbon prints" for the historic process which often doesn't even use carbon black
You are displaying your ignorance, what do you think is used to make watercolor pigments? If you guessed carbon black for black color you would be correct. Depending on the color not only is carbon black used, but also chromates, cadmiun and many other metals which impart the particular color to the pigment. In addition real carbon prints are not made only of water color pigments, there are other pigments used as well. Many of which are carbon or carbon in combination with metals."
Au contraire - I don't believe it is my ignorance that is on display.
Fron "Making the Pigment (Carbon) Print"
"The "Carbon" in the term "Carbon process" is really a misnomer nowadays, since the colorant now used is a mixture of permanent watercolor pigments. However, Carbon Black was originally used and the name remains. The popularity of these beautiful prints has suffered in the past because many people think that Carbon granules are somehow incorporated into the final image."
The point being that many "Carbon" prints - monochrome ones - don't actually incorporate any carbon/carbo black pigment at all - but rather pigments of different sorts.
So now, who exactly is being "ignorant, naive, disingenuous, or some combination of the above" I wonder? "Carbon" print makers perhaps?
BTW, having dealt with a good number of "carbon prints" in collections I can say that their longevity can be somewhat overstated - poor storage leads to serious deterioaration, and while the pigment may be fine and last for aeons, many were and are made on substrates that can display serious deterioration long before that even when stored in ideal conditions.
Now I had better go and make some Gelatin Silver Fibre Based Enlarger prints
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