3 or 4 color carbon can be a difficult process since each tissue has its own
contrast curve and exposure requirements. On the other hand, if a stochastic
negative is used (random dots) the only requirement is to determine the
exposure needed for maximum density for each color and then let the pre-process
determine the color balance of the finished print. Basically a halt-tone type
print rather than a continuous tone print.
Howard Efner
73 de KF5RGU
On Apr 28, 2019, at 02:26, `Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:
- - - - - -%< - - - -
I got interested in carbon a long time ago. Its practical for monochrome
but the three color carbon requires even more control than dye transfer.
Three color carbon was widely used for advertising illustration but was
eventually replaced by dye transfer and Kodachrome. The color in carbon
prints is a pigment so it is very long lasting.
- - - - - - %< - - - - -
--
Richard Knoppow
dickburk@xxxxxxxxxxxxx
WB6KBL
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