[pure-silver] Re: Old Agfa 120 Brown Black Developer {120 (Potassium Version) print developer}
----- Original Message ----- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx> 
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, January 31, 2007 6:42 PM
Subject: [pure-silver] Re: Old Agfa 120 Brown Black Developer {120 (Potassium Version) print developer}
----- Original Message ----- From: "Tim Eitniear" <timeitniear@xxxxxxxxxxxxx> 
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, January 31, 2007 5:23 PM
Subject: [pure-silver] Re: Old Agfa 120 Brown Black Developer {120 (Potassium Version) print developer} 



Lloyd,
The Agfa paper did tone brown, but it was darker than I wanted, but toned much more than I expected for not being a warm tone paper. As far as the Bergger went, the brown was what I expected, but not the whites. I tried to find an example of what is in my head, but to no avail. I imagine I just need some more practice and tweaking my process. My negatives were pretty dense, which may have contributed which may be one of the reasons my whites were not what I expected. 


Tim Eitniear
Chicago, Il
The amount of Potassium Bromide in a developer will have a strong effect on the results of a toner. Generally, the more bromide the greater the toning. Ryuji Suzuki brought this to my attention. He referenced a patent by Ira Current, who used to be with Ansco. There may be more on Ryuji's web site, I haven't checked yet.
The patent refered to above is USP 2607686 available from the U.S.Patent office site or Google Patents. What it shows is that _cold_ sepia tones are produced when there is a lot of bromide in the developer. This is just the opposite of the conventional wisdom, namely that increasing bromide results in yellower tones in toned images. The patent has sample formulas. 

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 
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