[alt-photo] Re: pd/pt coating solutions

[EJ Photo]

David, I would first try it WITHOUT the chlorate in either case. The
chlorate will decompose over time so unless you do a bunch of printing right
away, the next time you go to use it , it may have a different contrast. Two
it does add some graininess so test the look without it first and see if it
works for you. 

Pot Chlorate can be added as a separate solution too. 

the percentage solution is the key. What are you doing about the PD and PT
solutions? ordering them in powder too? 

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, March 29, 2011 11:14 AM
To: The alternative photographic processes mailing list
Subject: [alt-photo] pd/pt coating solutions

	I was looking at two different formulas and was wondering what
others  
would use in these situations when using  pd/pt 1:1 with the addition  
of  2 drops of 5% gold chloride and 3:1 without any gold?  I have been  
using the premixed solutions from Bostick & Sullivan for all my  
printing and want to make the move to mixing my own for the control of  
supply and savings.

I have the following formula I got from Dan Burkholder:  #1 - 75ml  
H2O, 4 grams EDTA, 28.8 grams Ferric Oxalate.  #2 - 75ml H2O, 1.1  
grams Potassium Chlorate, 4 grams EDTA,  28.8 grams Ferric Oxalate.   
Which he states is customized for the 1:3 ratio of pt/pd.

The other is from Dick Arentz's book of Platinum & Palladium Printing   
2nd ed.: #1 - 15 grams Ferric Oxalate, 1 gram Oxalic acid, 55ml H2O.   
#2 - to 55ml of #1 add .33 grams of Potassium Chlorate.

Any thoughts or recommendations of which to use when or other formulas  
are appreciated.

Thanks,
David
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