Hello
in my limited experience, I've used only 1 negative or positive (sometimes
in combination) using varying exposure times to effect the highlights and
shadows.
I recently had the opportunity here in Toronto to view a particular well
known gum printer's print at a gallery in the city. Apparently, this
photographer combined digital manipulation, and color separated negatives to
create his gum prints, which in my opinion looked like an unintentional
parody in approximation of a kodachrome look, or a dye transfer look.
I am curious about using color separated negs, but I'm also unsure about the
reasons why one would employ a historical and amazingly versatile technique
such as gum (versatile in its painterly sense, in the ease of manipulation
that one can achieve to create something more than a simple color photograph
using pigments and dichromate instead of dyes and silver) to make a print
that seems to strive to look like a straight color photo. I always had a
tingling feeling that various masking techniques, and play during
developing, could afford the process something *different*, and something
wonderful.
This all falls into the category of whether the original question implies
more than one negative re: color separation, or more than one negative re:
collage.
collage is cool
perhaps the wrong answer for a tech list?
Risa