[pure-silver] Re: Silverholes... was Pinholes in Lith
- From: "J. Stewart" <jrstewart@xxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Wed, 13 Oct 2004 16:02:36 -0400
Thanks for all the comments, folks.
I haven't yet tried a good, low-alkalinity developer yet (anyone suggest one
I can mix up myself that doesn't use carbonate?) but I have ruled out some
things.
Ryuji, I did try a different pack of film from a different lot.. I saw no
improvement / change. It's Arista Ortho Lith.
First, the pinholes (and actually pin-lines) I'm getting vary in size (up to
perhaps 1/32 inch), and the density (# per unit of area on the film) of them
vary widely from one plate to the next. Size and variability differ so much
that use of lith for what I want is futile, so I'm interested in solving
this problem. This is for masking purposes, using the lith mask alone in
the negative carrier.
One of the conditions that seem to reduce the number and size is exposure. I
developed plates the same way after exposing them by contact print under a
step wedge. Exposure was twice to three times my control exposure.
Interesting finding: as exposure increased and density on the emulsion
increased, the size and # of holes/lines drastically reduced. Development
time (exposure equal) did not alter the character of holes/lines.
I also tried to see if the defects were there before fixing. After water
rinse, I turned on the inspection lite and viewed the lite directly thru the
film... no evidence of "holes, spots, or lines". Within a minute of fixing
in TF4 (alkaline fix), that same film had very obvious spots and lines.
I'm wondering if alkaline fixer might be the problem, not the alkalinity of
the developer. Most developers are around 8- 8.5; I think alk fixers are
higher pH.
Is it possible that the problem is my fixer, not my other processes?
Jim
----- Original Message -----
From: "Ray Rogers" <earthsoda@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, October 13, 2004 3:14 AM
Subject: [pure-silver] Silverholes...
>
> --- Ryuji Suzuki <rs@xxxxxxxxxxxxxxx> wrote:
>
>>Films made by major manufacturers contain small pin
>>holes... They are very visible under decent optical
>>microscope....
>
> #1
> Hummm... Who are you excluding here? I mean
> What about the films made by the MINOR manufacturers?
>
> Do their films contain bigger holes?
> Or do they just make a hole-lot-less film?
> ;+)
>
> #2
> Ryuji, have you ever used Kodalith?
>
> I suspect the pinholes referred to are in the range of
> hundreds of microns in diameter....
>
> When I was using Kodalith the pinholes were visable
> under a decent optical device called the human eye!
>
> Jokes aside,
>
> I went back to Jim's post and found this:
>
> From: "J. Stewart"
> Date: Sun, 10 Oct 2004 15:16:27 -0400
>
> I've tried everything I know to avoid pinholes on
> lith.
> <snip>
> I'm using Arista Lith 4x5.
> I get sometimes hundreds of very tiny specks on the
> densest parts of the film
> (where they are most obvious). None are over the size
> of a pinhead. The number
> of specks is highly variable, suggesting it's not due
> to a manufacturing defect.. or maybe it is).
>
> Is there something about using lith that others can
> share to help me solve this
> problem?
>
> Jim
> --------------------
> Jim, I think it was Jerry who wrote that a certain
> amount of pinholes are to be expected.
> It (the presence of pinholes) was always my
> experience.
>
> Are you new to working with lith film?
>
> I belive this may be a case of where emulsion
> technology did not progress far enough to result in a
> really excellent marketable product.
>
> Not all products actually reach an acceptable level of
> quality before they are put on the market and become
> widely used.
>
> Perhaps now there is a lith film that is totaly free
> of pinholes, but I only used KODALITH ORTHO so my
> experience is limited to that product:
>
> It was standard practice not to begin any work with
> lith film without a bottle of either the black or red
> opaque and a brush.
> -------------------------------------
> BTW rePureRyuji
>
> I tried to check out Ryuji's silver list but get/got
> no response... What's happening?
>
>
> Ray
>
>
>
>
>
>
>
>
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