[pure-silver] Re: multigrade paper is amazing
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 8 Nov 2007 15:08:32 -0800
----- Original Message -----
From: "Dave V" <DValvo@xxxxxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Thursday, November 08, 2007 1:44 PM
Subject: [pure-silver] Re: multigrade paper is amazing
This email is a joke... right?
----- Original Message -----
From: "Shannon Stoney" <shannonstoney@xxxxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Thursday, November 08, 2007 1:16 PM
Subject: [pure-silver] multigrade paper is amazing
I just did an interesting experiment. I printed a stouffer
step tablet on Ilford warmtone multigrade paper, beginning
at #00 filtration and ending at #5 filtration. I found
out that the paper scale varies not a little bit, but a
whole lot!
After printing the step tablet, I read its values on a
densitometer. I found out that at filtration #00, the
paper has a scale of 1.5. It printed about 12-13 steps
between say zone 3 and zone 7. On the other hand, at
filtration #5, it had a scale of only 0.47 and printed
only 4-5 steps between zone 3 and zone 7.
This is pretty amazing to me. How does it do it? I know
that it has something to do with the layers of emulsion.
But still.
--shannon
I don't think its a joke. And, BTW, since you are by
way of being a paper expert, can you clarify how VC paper
works. In whatever the old Ilford Manual is called now
(edited by Jack Coote) its stated that both emulsion
components are of the same contrast but different
sensitization. I can't figure out how two emulsions with the
same contrast could result in a variation of contrast no
matter how they were combined. I can see only a variation in
sensitivity. Did Kodak use one or more components of
different contrast or is there something in the Ilford
explanation that I just can't get?
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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