Re: Gum dichromate issue

From: Sandy King ^lt;>
Date: 08/09/04-09:18:49 PM Z
Message-id: <a06020418bd3dee33afb3@[]>

There were more than a few full books put out on making separation
negatives for the graphic arts. If you like I will try to provide you
with full citations. I know there is at least one very good one in my
university library and I suspect that if you do a search on a good
public or university library in your country you will find the same.

However, as someone who has actually made three-color carbon and
carbon prints with film separations let me assure you that it takes
a lot of time. There is no way in the world I would every think of
doing that kind of work again without making digital separations on
the computer.


>> I do have several questions and probably too many but the first is:
>> Is there any book you recommend me to read that deals with the three
>> negatives instead of the Kodak single color negative?
>Good question. The best books on separation practice I recall were short
>things put out by Kodak that were out of print long ago. I'll look through
>my photo books and see what I can find. First, you have to separate the
>colors. Are you intending to make three in-camera negatives, or shoot
>color film (or digital) and do the separation later?
>The basic issues are (i) getting the color balance right, which is a matter
>of using the right filters and choosing the right exposure and development
>for the three negatives [with DT, one often develops the 3 negs to
>different contrast levels -- I suspect the same may be true of other
>processes]; and (ii) registration of the three [or four, with a luminance
>layer] negatives. In the old days, we punched holes in unexposed film and
>used pin-registered film holders, enlarger negative holders, and printing
>frames throughout the process. Condit, the manufacturer of
>pin-registration equipment, went out of business a few years ago. I
>understand that shrinkage is a factor with multi-layer gum, so registration
>may be more of an issue for you than it is for DT printers.
>Best regards,
Received on Mon Aug 9 21:19:23 2004

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