[pure-silver] Re: Yellow edges

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."
=============================================================================================================
To unsubscribe from this list, go to www.freelists.org and logon to your 
account (the same e-mail address and password you set-up when you subscribed,) 
and unsubscribe from there.

Other related posts: