[pure-silver] Re: FW: Re: What happend? CORRECTION

It occured to me once when doing lots (>100) of Christmas postcards processed 
to quickly and very likely not properly fixed/washed.
I developed them four sheets at a time and some shows this problem, others not.

Paper was Ilford Multigrade IV RC *but* I strongly think it is not related to 
the paper as I regularly use this paper in similar conditions without having 
problems when correctly processed.

Claudio Bonavolta
http://www.bonavolta.ch

----- Message d'origine -----
De: "Dave Valvo" <dvalvo@xxxxxxxxxxxxxxxx>
Date: Thu, 29 Jun 2006 09:49:43 -0400
Sujet: [pure-silver] Re: FW: Re: What happend? CORRECTION
À: <pure-silver@xxxxxxxxxxxxx>

>Question::::   On whose (manufacturer) RC paper are theses "stains" appearing. 
> Would like to hear from everyone that has seen this. 
>
>Dave
>  ----- Original Message ----- 
>  From: Sandor Mathe 
>  To: pure-silver@xxxxxxxxxxxxx 
>  Sent: Thursday, June 29, 2006 9:21 AM
>  Subject: [pure-silver] Re: FW: Re: What happend? CORRECTION
>
>
>
>  There must be a significant chemical difference between the pure white 
> borders and the light grey 
>  areas when it comes to forming the pinkish or golden brown stain.  I have 
> some prints where the brown 
>  stain follows the density contours in the image exactly (like a 
> posterization line) slightly darker grey areas 
>  are not affected and white areas are not affected.  It almost always seems 
> to be the lightest grey 
>  areas that are effected.  Again I have never seen this with my fibre prints, 
> only RC.   
>
>  Did my darkroom care change that much when I switched to exclusively fibre 
> paper for all display prints?   
>  Or is it completely due to using a two bath fix process, which I always use 
> with fibre prints. 
>  I don't know.  My stained prints are all at least 7 years old. 
>
>  Sandor   
>  pure-silver-bounce@xxxxxxxxxxxxx wrote on 06/29/2006 07:58:38 AM:
>
>  > I suddenly realised my test was not complete: I only tesed the white
>  > borders, so I also put some 1+9 KRST on the golden borwn coloured area,
>  > and sure enough: a bright red stained spot appeared (which could be
>  > wipped of easily), so it's inadequate fixing after all, and through some
>  > "funny agitation" the borders are still white (somehow I find this hard
>  > to believe: the white borders arearound the grey , now brown sky and
>  > there is an abslute sharp border between both colours)
>  > 
>  > Best,
>  > 
>  > Cor
>  > 
>  > > -----Original Message-----
>  > > From: Breukel, C. (HKG)
>  > > Sent: donderdag 29 juni 2006 13:42
>  > > To: 'pure-silver@xxxxxxxxxxxxx'
>  > > Subject: RE: [pure-silver] Re: What happend?
>  > > 
>  > > Hi Richard,
>  > > 
>  > > >
>  > > >    It could still be incomplete fixing. Some methods of
>  > > > agitation will cause more flow at the edges of a print than
>  > > > others. This can also be true of washing. The blotchy effect
>  > > > sounds like insufficent fixing to me.
>  > > >    One way to find out is to test the print using either the
>  > > > sodium sulfide test or the Selenium toner test. The Selenium
>  > > > test is simply a solution of KRST diluted 1 part toner to 9
>  > > > parts water.
>  > > 
>  > > 
>  > >     Place a drop of either solution on a clear area of the
>  > > > print or film. Leave for a minute or two and blot off. There
>  > > > should be no visible stain.
>  > > 
>  > > 
>  > > I just did above test with KRST 1+9, no visible stain (the print was
>  > > untoned)
>  > > 
>  > > I got offlist an JPEG which npretty much showed the same phenomena,
>  > golden
>  > > brown colour in a small "grey-zone", only on a partculair size of
>  > paper
>  > > 
>  > > Best,
>  > > 
>  > > Cor
>
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