[pure-silver] Re: Purple-Tinted Negs

Unless they are talking about a very large amount of carryover, weak
fix, etc. that is not an issue. Especially with rapid fix, don't worry
about that stuff. Several Ilford developers contain a lot of potassium
salts but they don't cause problems when used as directed.

Also, this is unrelated to purplish negs. Purplish color often come
from the film base itself. Nothing can reduce that.

Sensitizing dye can be washed out by longer washing aid treatment and
longer washing time.

Antihalation dye is nothing to worry about. They are washed out by
presoak, or bleached by the developer.

There is one more suspected cause of bluish color in some cases, and
I'm investigating a way to reduce it... will follow when I get more
definite results.



From: "Gareth Jolly" <garethjolly@xxxxxxxxxxx>
Subject: [pure-silver] Re: Purple-Tinted Negs
Date: Tue, 30 May 2006 22:03:43 +1000

> Found my Film Developing Cookbook (by Anchell & Troop) and can now be 
> slightly more helpful
> 
> - Developers or stop baths high in potassium salts can therefore 
> significantly lengthen fixing time.
> - This is because the presence of potassium salts in the fixing process can 
> significantly lengthen fixing time.  The reason is that they partially 
> convert ammonium or sodium thiosulfate to potassium thiosulfate
> 
> The film developing cookbook recommends
> 
> - not using a stop bath based on potassium metabisulfite or another 
> potassium salt
> - if using a water stop, either have at least 60 seconds rinse in running 
> water or five complete changes - before placing in the fixer
> 
> See page 107
> 
> Regards
> Gareth
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