[alt-photo] Re: Gold chloride in Pt/Pd sensitizer

[EJ Photo]

Jon, The color and the effects depend on a variety of situations which is
why you site all those in your question. The gold reacts very fast with
platinum, which is why Mike suggest not using it because he prefers not to,
not because it can't be done. It just will start to react when added to the
solution. Which can lead to streaks, and color that includes violet. Is it
wrong? just not a smooth print. Can it lead to less grainy prints? it does
smooth out the highlights but CAN add grain if you use it with .....  


Best thing to do is try it and find out how you like it. Buy a stronger
solution which can be diluted, very hard to make a strong solution out of a
weak one : ) 

There are several ways to cool an image, if that is all you want to do.  
 
Eric

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
Jonathan Reid
Sent: Sunday, May 02, 2010 7:39 AM
To: The alternative photographic processes mailing list
Subject: [alt-photo] Gold chloride in Pt/Pd sensitizer

Hi all,

I was hoping to get a consensus view on the addition of gold chloride  
in Ferric Oxalate. Dick Arentz claims that one drop 5% gold chloride  
added to the sensitizer will cool the image tone and possibly reduce  
granularity.

I have read other reports that state one drop of 1%. Then there's a  
book called New dimensions in photo processes: a step-by-step manual
  By Laura Blacklow, in which she states that "1-2% gold chloride, a  
few drops to warm the tones and reduce the contrast of a platinum  
print". I don't own this book but it showed up in Google Books after a  
search.

Mike ware seems to discount the use of gold chloride in all but pure  
palladium prints. I can't check my Christopher James book right now as  
it is not with me.

I searched the archives of the list but only really found references  
to post-development toning using gold chloride.

I'm printing 5x7 pyro negs with 6 drops sensitiser and 7 drops metals.  
Bostick and Sullivan sell it in 0.2%, 1%, 5% and 10% strengths.

Lastly, is the effect the same as gold toning post-development. If so  
I can see advantages ion not handling/wetting the paper twice.

Sincerely,

Jon
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