From: Liam Lawless (liam.lawless@blueyonder.co.uk)
Date: 09/18/02-06:13:44 AM Z
George,
Sorry you're still having trouble. My guess is that another process
(cyanotype, etc.) wouldn't necessarily do the same thing, but one other
suggestion. After printing, give the first rinse in pure water
(distilled/deionised), or tap water that has been boiled and allowed to
cool. Not a lot needed - say about 250 mL for an 8X10 - and leave it on the
print for about a minute, then continue washing for another minute or two
under the tap. This *might* work because tap water can cause problems in
some locations, forming compounds that produce stains (oddly, often not
until the final wash). I suspect that a lot of dissolved oxygen in the
water is the culprit (forming silver oxide), but that's only a guess; the
first rinse with pure water carries away any free silver nitrate before it
can react. (Note that pure water stays clear, whereas boiled tap water
turns cloudy, but this doesn't matter.)
Maybe this isn't your problem since it wasn't mine. But I have had it with
salt prints and another process I'm working on, so good luck! A second coat
should increase contrast/D-max, not reduce it, but will take longer to
print.
Liam
-----Original Message-----
From: George L Smyth [mailto:glsmyth@yahoo.com]
Sent: 18 September 2002 12:37
To: alt-photo-process-l@sask.usask.ca
Subject: RE: Van Dyke Problem
Liam -
Last night I tried printing by changing the operation so that I coated once,
then wiped off the excess with a dry foam brush. I then waited fifteen
minutes
and coated again, then wiping with the dry brush. I am still getting those
spots (and I lost contrast, though I an assuming that that was due to the
scnd
coat).
I am beginning to suspect the paper, as I have no other possibilities in
mind.
I won't be home tonight, but will try printing Thursday night with cyanotype
on
this paper to see if I yield the same results.
Cheers -
george
--- Liam Lawless <liam.lawless@blueyonder.co.uk> wrote:
> George,
>
> Further to the advice I gave the other evening, I've just had the same
fault
> on Arches Platine, having done what I suggested you do. At the moment,
> three possibilities occur to me. The latest print was made on paper from
a
> batch that I've had a couple of years, whereas newer paper printed OK. Or
> maybe penetration of the sensitiser was uneven owing to the fact that I
> dried it too quickly. Or maybe it was only superficially dry, resulting
in
> local variation of sensitivity. More tests tonight, and I'll report back
> tomorrow.
>
>
>
> Liam
>
> -----Original Message-----
> From: Sandy King [mailto:sanking@clemson.edu]
> Sent: 16 September 2002 14:45
> To: alt-photo-process-l@sask.usask.ca
> Subject: RE: Van Dyke Problem
>
>
> George wrote:
>
>
>
> >My normal coating operation involves coating it once, changing direction
> and
> >moving the foam brush over it again, then wringing the brush out,
changing
> >direction, then going over it again, then repeating this in the fourth
> >direction, in an attempt to ensure an even coating. In the example I
only
> >brushed in two directions, since I was just putting together a test strip
> to
> >get a general exposure idea.
> >
> >I will attempt it again with your idea of moving over it with a dry brush
> >following the initial application. You may be right that the paper could
> be a
> >problem, as I don't know of anything else that has changed in my routine.
> >
> >Cheers -
> >
> >george
>
>
>
>
> My coating method is rather similar in that I making multiple passes
> in order to even out the coating. This includes passes on the
> horizontal, vertical and diagonal of the coating surface. However, I
> coat with either a Hake brush or the Richeson "magic brush". Both are
> much softer and abrade the paper less than common foam brushes.
>
> Sandy King
>
>
>
> >
> >
> >
> >--- Liam Lawless <liam.lawless@blueyonder.co.uk> wrote:
> >> George,
> >>
> >> Looks like a problem I've had, but with finer "pitting" that vaguely
> >> resembles very coarse reticulation. It occurred for me on Arches
> Aquarelle
> >> hot-pressed paper, and I believe it is caused by uneven absorption of
> the
> >> sensitiser. The paper you're using may be partly to blame, but maybe
> you're
> >> also making it too wet. I got rid of it by slapping on the first coat
> >> quickly (w/foam brush), then going over it with a dry brush, and then
a
> hair
> >> dryer. It's not necessary to get it bone dry at this stage, just
don't
> >> allow the paper to stay too wet for too long. After the hair dryer, I
> give
> >> a second coat in the same way, and print when thoroughly dry.
> >>
> >> At the moment I'm using Arches Platine and have had no problems with
it.
> >> (But it prints a lot more contrasty than other papers.) In my
> experience,
> >> papers can vary a bit from batch to batch, so if the same paper has
been
> OK
> >> for you before, maybe this batch isn't sized quite as well.
> >>
> >> Unless someone has another explanation...
> >>
> >>
> >>
> >> Liam
> >>
> >> -----Original Message-----
> >> From: George L Smyth [mailto:glsmyth@yahoo.com]
> >> Sent: 16 September 2002 02:02
> >> To: alt-photo-process-l@sask.usask.ca
> >> Subject: Van Dyke Problem
> >>
> >>
> >> I've been doing Van Dyke for quite some time (well, on and off), and
> have
> >> come
> >> across a real problem. I am getting some sort of pitting in my
images,
> and
> >> I
> >> can't seem to track down the source of the problem. An example of a
> test
> >> strip
> >> showing this can be found at
> >> http://mywebpages.comcast.net/hmpi/Temp/Pitting.jpg.
> >>
> >> I am using the standard chemical (the first formula found in Judy's
> >> publication, volume 1), so there's nothing weird there. I apply with
a
> foan
> >> brush. I am developing with water for about 3-4 minutes, fixing with
a
> 5%
> >> sodium thiosulfate solution for about 3 minutes, then washing (I've
> tried
> >> using
> >> and not using PermaWash, without any difference). I am using Arches
> >> Aquarelle,
> >> which in the past has worked just fine.
> >>
> >> As far as I know, there has been no change in the water.
> >>
> >> Does this problem look familiar to anyone? I haven't had this problem
> in
> >> the
> >> past and it first started happening about two months ago. I put
> everything
> >> down, as I didn't have time to do any alt process, but returning I am
> seeing
> >> the same problem.
> >>
> >> Any ideas would be greatly appreciated.
> >>
> >> Cheers -
> >>
> >> george
> >>
> >> =====
> >> Handmade Photographic Images - http://GLSmyth.com
> >> DRiP Investing - http://DRiPInvesting.org
> >>
> >> __________________________________________________
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> >>
> >
> >
> >=====
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> >
> >__________________________________________________
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>
> --
>
>
=====
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