Mainecoonmaniac
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- Joined
- Dec 10, 2009
- Messages
- 6,295
- Format
- Multi Format
...mutigrade paper was for photographers that didn't
know how to control the contrast of their negatives.
I can watch the easel while spinning the color knob to see what looks right and the contrast prints right. Sort of like looking at how thin or thick a negative is you know it looks intuitively right, you can do the same visual judgement with magenta/yellow and contrast.
The grade of a Graded paper is not fixed. Choice of
developer alone can allow for at least a grade's variation
on many papers. Also post exposure pre-development latent
image bleaching, SLIMT, makes Graded paper grade
changes easy...
OK...I found the references to SLIMT provided by
David Kachel. Ed
In effect SLIMT, a post exposure pre-development bleach,
increases shadow area densities in the negative. Additional
exposure is needed in order to maintain good shadow area
density in the print. High light densities in the negative
which might not print at all are drug along with that
additional exposure. The contrast range of the
negative is compressed.
In effect a negative which through exposure and/or
development has too great a contrast range is made
correct. Corrections can be minor or major.
Once the exposure characteristics for a paper have
been established and it's solution's working strength
known all that follows is short soak in an EXTREMELY
dilute potassium ferricyanide solution. Dan
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