Since you're paying for shipping, buy two. "Nothing, for which you have a
spare, ever breaks."
Mark Sampson
-----Original Message-----
From: Claudio Bonavolta <claudio@xxxxxxxxxxxx>
To: pure-silver <pure-silver@xxxxxxxxxxxxx>
Sent: Wed, Jul 19, 2017 06:11 PM
Subject: [pure-silver] Re: bulbs for Durst M605
<div id="AOLMsgPart_2_45d3ee49-07b2-4f23-97ee-e2fefed91eed">
<div class="aolReplacedBody"><div>There is a dedicated chapter in <i><b>Way
Beyond Monochrome</b></i> that explains the procedure to match precise grades
with a color head:
<a target="_blank" rel="noopener noreferrer"
href="http://www.waybeyondmonochrome.com/WBM/TOC.html";>http://www.waybeyondmonochrome.com/WBM/TOC.html</a>
Some chapters were available on this site in the past, including the one that
interests us but, unfortunately, this no more the case.
Searching the web, I found it on another site (extracted from the first edition
of the book):
<a target="_blank" rel="noopener noreferrer"
href="http://babardestcyr.free.fr/CntrstCtrlClrEnlargers.pdf";>http://babardestcyr.free.fr/CntrstCtrlClrEnlargers.pdf</a>
Anyhow, this book has a lot more than this and is an absolute must have ...
Ilford has a documentation on its Multigrade paper and color filtration tables
through 2 methods:
- single filtration - only one color at a time, from yellow to magenta, to
achieve all grades. Exposure varies from one grade to the other.
- double filtration - using a variable mix of yellow and magenta to achieve
most of the grades but keeping exposure constant between the grades.
<a target="_blank" rel="noopener noreferrer"
href="https://www.ilfordphoto.com/wp/wp-content/uploads/2017/03/Contrast-control-for-Ilford-Multigrade.pdf";>https://www.ilfordphoto.com/wp/wp-content/uploads/2017/03/Contrast-control-for-Ilford-Multigrade.pdf</a>
As you indicated, Paul Butzi also wrote something on the topic but his former
website (butzi.net) does not seem available anymore.
The article is still available here: <a target="_blank" rel="noopener
noreferrer"
href="http://fliphtml5.com/exru/vhtf/basic";>http://fliphtml5.com/exru/vhtf/basic</a>
<div id="aolmail_editorUserSignature"><p></p>
Claudio Bonavolta
<a href="http://www.bonavolta.ch" target="_blank";>www.bonavolta.ch</a>
<p></p>
</div>
<i>19 juillet 2017 18:10 Myron Gochnauer <<a
href="mailto:goch@xxxxxx";>goch@xxxxxx</a>> a écrit:</i>
<blockquote class="aolmail_infmailquote">
Here's something that contains good information, including data for a DeVere
colour head: <a target="_blank" rel="noopener noreferrer"
href="http://phototechmag.com/a-better-choice-than-vc-filters/";>http://phototechmag.com/a-better-choice-than-vc-filters/</a>
As you can see, the primary adjustments are to the Yellow and Magenta
filtration. The Butzi (?) article explained a way of keeping the exposure
times uniform. (It was something equivalent to adding or subtracting
VC-neutral-density filtration.)
<div><blockquote><div>On Jul 19, 2017, at 12:36 PM, Myron Gochnauer <<a
target="_blank" rel="noopener noreferrer"
href="mailto:goch@xxxxxx";>goch@xxxxxx</a>> wrote:
<div>
<blockquote>I only print black and white so does that mean the color head is
irrelevant for my purposes?
</blockquote>
<div>No. Many of us have used colour heads for B&W. If you use VC paper you
may need to experiment a bit to determine the best settings for various grade,
as well as exposure times. There should be info on this somewhere on the
internet. Years ago there was a good article about it in Photo technique or
Darkroom & Camera, I think. Maybe someone remembers. Author may have been Paul
Butzi (?)
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