[pure-silver] Re: Silverholes... was Pinholes in Lith
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Wed, 13 Oct 2004 17:03:20 -0700
----- Original Message -----
From: "John Black" <jblack@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, October 13, 2004 1:41 PM
Subject: [pure-silver] Re: Silverholes... was Pinholes in
Lith
>
> 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.
>
>
> I don't have my A&T here right now but most of the alk
> fixes I have used and
> seen are very weakly alkaline, in the neighborhood of
> 7.0-7.4.
>
> Your observation shows that something is happening in the
> fix though. Are
> you water rinsing or acid stopping before fixation?
>
> JB
>
Have you tried using a conventional stop bath and acid
fixer? It may be that a hardening fixer will help.
Also, what developer are you using? If its very alkaline
a stop bath with some sodium sulfate in it will help prevent
blistering. I beleive Ryuji has mentioned that metabisulfite
stop baths do not cause outgassing from carbonate developers
but I am not sure.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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