[pure-silver] Re: New color head "discoveries"
- From: "J.R. Stewart" <jrstewart@xxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sun, 16 Jan 2005 08:21:18 -0500
Thanks, everybody who weighed in on this question. I learned a lot from the
discussion. High points:
1. Not all papers react the same to dichro filter settings; some papers, on
some enlargers, may not reach the extreme ends of the ISO grade standards.
The most common solution for this is to use under lens or equivalent filters
(i.e, filter 0 or filter 5), but replacing the filters in the head might
help because they fade after a while.
2. Different developers with VC papers may give different scales, but it's
unlikely that the response range is anything like graded papers.
Glycine/metol, phenidone, or MQ developers all work for VC. The apparent
difference in scale one gets with two different developers may be eliminated
by using different development times or dilution factors. Lith developer may
be an exception, which counters what I just said, doesn't it--or perhaps
lith developers merely accentuate the small differences in paper contrast
observed with common MQ or phenidone developers.
3. The Thomas safelight emits light that VC emulsions can't tolerate very
well. Recommendations ranged from welding the Thomas shut or converting it
to a planter, to moving it to a far corner and using the lowest light
possible, to using a red filter on it.
This discussion generated a bunch more questions.. but those are for another
day ! In the meantime I'll work on your many recommendations and
suggestions.
Thanks, group.
J.R. Stewart
Leesburg, VA
----- Original Message -----
From: "J.R. Stewart" <jrstewart@xxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, January 12, 2005 7:39 PM
Subject: [pure-silver] New color head "discoveries"
> Well, my Omega Chromega Dichro DII came in last weekend and I've begun
> testing. with VC papers. First VC I've printed in 20 years.
>
> I've been using metol glycine based Ansco130 paper developer (modified by
> AA
> and without hydroquinone).That's where I started. Problem is, the hardest
> contrast I was able to get with 0Y/170M was about 0.8 on Forte Polygrade V
> (boy is that paper really blue!!) and about 0.6 on Kodak Polymax Fine Art.
> The softest contrast comes in about right at 1.8 (polymax) and 1.4
> (polygrade).
>
> Glycine is a much softer developer.. is that why I'm able to get no more
> than ISO ~3.5 on the VC papers... do the emulsions require stronger
> developers for satisfactory development? I tested my graded papers under
> white light exposure, developed them in A130, and acquired the right
> scale.
> I developed all the test prints at 6x factorial so I would think that
> would
> be sufficient, and I was able to get max black.
>
> I ran an Ansco 120 test last night. The test prints look better, but
> haven't
> read them yet.
>
> Also, I learned that both of these paper are very sensitive to the Thomas
> safelite... I ran a screening test and at 5 minutes exposure I got fog
> that
> appeared as Zone VI reflectance.. So, I move the safelight, unplug it, or
> change papers to one less sensitive, and retest. Such is life.
>
> J.R. Stewart
> Leesburg, VA
>
>
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