[pure-silver] Re: Yellow edges

Sounds like an experiment is in order - maybe two similar emulsions on
different bases, say Multicontrast classic and premium? At the same time,
try deliberate over-fixing and then compare wash times etc.


On 26/5/05 6:13 pm, "Ryuji Suzuki" <rs@xxxxxxxxxxxxxxx> wrote:

> From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
> Subject: [pure-silver] Re: Yellow edges
> Date: Thu, 26 May 2005 01:17:01 -0700
> 
>>     Well, if you will explain to me just how I can transfer
>> the emulsion from some of my printing paper to a glass plate
>> I am sure that observing the clearing time will be very
>> simple. However, since I don't make my own emulsion I have
>> to use already coated paper as supplied by Kodak, Ilford,
>> Agfa, et.al. where it is difficult to observe clearing.
> 
> That's why I gave those figures to give you ballpark estimate of how
> long printing emulsions take to fix in neutral rapid fixer.
> 
>>     For some reason Kodak thinks that the use of a sulfite
>> wash aid does help remove some silver complexes that
>> otherwise stay in the emulsion. I can't give you a specific
>> citation. Check the orignal paper (can't remember the exact
>> title right now but you know which). I have also seen
>> figures on fixer capacity from Kodak indicating higher
>> capacity when a wash aid was used. Perhaps they've got it
>> wrong but I didn't invent the idea out of the blue.
> 
> Now you are talking about different things. Before you were
> specifically talking about silver halide, the unfixed material, and
> you spoke as if sulfite would remove them. Now you are referring to
> partially fixed argentothiosulfate complexes. Don't mix up these
> because they are different.
> 
> --
> Ryuji Suzuki
> "Keep a good head and always carry a light camera."
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-- 
Regards Chris Woodhouse



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