[pure-silver] Re: Avoiding pinholes on lith
- From: "J. Stewart" <jrstewart@xxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Wed, 13 Oct 2004 16:06:18 -0400
Peter wrote:
>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.
What did you switch to Uncle Dick?
Jim
----- Original Message -----
From: "J. Stewart" <jrstewart@xxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Monday, October 11, 2004 9:11 AM
Subject: [pure-silver] Re: Avoiding pinholes on lith
> Peter, thanks.
>
> I did try lith developer 1+1 and still got pinholes. This developer has HQ
> and sulfite in Part A and carbonate and hydroxide in Part B (Arista Lith
> Developer, I think).
>
> I have D76/ID 11... it uses borax instead of carbonate. It contains both
> metol and HQ... most lith developers have only HQ. I'd like to mix up
> something quickly as I have to mail-order all my chemistry and don't want
> to
> wait.
>
> I wonder if I could make up a developer with a "lith" concentration of HQ
> but use Borax and sulfite concentrations of D76. Any thoughts on this
> approach?
>
> I searched thru Photo Lab Index but didn't find anything that would help.
>
> Jim
>
> ----- Original Message -----
> From: "Peter De Smidt" <pdesmidt@xxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Sunday, October 10, 2004 10:10 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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>
>
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