[pure-silver] Re: Avoiding pinholes on lith
- From: "Gene Johnson" <genej2@xxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sun, 10 Oct 2004 19:36:28 -0700
I was having a similar problem with Techpan and Efke 25 developed in an
internet version of H&W Control. It used Sodium carbonate. I changed to
the super simple Windisch Compensating developer using just Catechol, Sodium
sulfite and Sodium Hydroxide and had no further problems with pinholes.
Just my $.02 Also got very normal contrast with full speed on both.
----- Original Message -----
From: "Peter De Smidt" <pdesmidt@xxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Sunday, October 10, 2004 7:10 PM
Subject: [pure-silver] Re: Avoiding pinholes on lith
> J. Stewart wrote:
>
> >I've tried everything I know to avoid pinholes on lith. I'm developing in
different developers (paper developers as well as lith developers) at fairly
concentrated levels (1+1 or full strength). I'm not using acid stop (I let
them rinse in plain water), and I'm using alkaline fix. I let the lith film
sit emulsion side up in the developer tray and am very careful when
agitating the file-- sometimes merely rocking the tray. I wash the films
vertically in a flow-thru washer. 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
> >
> >
> >
> >
> You might try a less alkaline developer. Paper developers often use
> carbonate, and lith developers often use sodium hydroxide, as
> accelerators. You might try a developer with a lower ph, such as one
> produced with sodium metaborate or borax. If I remember correctly, Uncle
> Dick had a problem with pinholes with xray film. He switched to a less
> alkaline developer, which greatly reduced the problem. Hopefully, U.D.
> can confirm.
>
> -Peter De Smidt
>
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