[alt-photo] Re: potassium phosphate

[EJ Photo]

David, Neutral is quite a bit cooler than warm. The difference that I saw
with cold bath was less than that shift. Using both may get you closer. The
addition of gold can certainly get you cooler yet. 

Humidity has been no secret for many years as a way to control color of
prints.  

Eric Neilsen
Eric Neilsen Photography
4101 Commerce Street, Suite 9
Dallas, TX 75226
 
www.ericneilsenphotography.com
skype me with ejprinter
www.ericneilsenphotography.com/forum1
Let's Talk Photography
 

-----Original Message-----
From: alt-photo-process-list-bounces at lists.altphotolist.org
[mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf Of
David Ashcraft
Sent: Tuesday, June 29, 2010 9:23 AM
To: The alternative photographic processes mailing list
Subject: [alt-photo] Re: potassium phosphate

Eric, I did a little reading
(http://www.bostick-sullivan.com/articles/zia_ware.html 
) and it appears to give just a neutral tone where the potassium  
phosphate was reported to give bluish tones (History & Practice of  
Platinum Printing by Nadeau).

Where you able to get cold tones using NH4?  According to the chart on  
the B&S site neutral is the best listed as far as cooler tones are  
concerned and that by controlling humidity.  I find it interesting how  
much humidity plays a part in these different processes.  Time to  
build a humidity chamber!?  Will it still be considered Alt if the  
humidity is controlled digitally? -:o)

David


On Jun 28, 2010, at 2:04 PM, Eric Neilsen wrote:

> You will get cooler prints, simply by changing the ion to NH4  
> instead of Na2 than using the cold tone developer. That may be a  
> bigger

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