[alt-photo] Re: Zia standard solutions

[Terry King]

Chris


If you use a negative suitable negative for platinum printing and  20% platinum  and 20% palladium solution you will get beautiful platinum prints with fine gradation and a full range of tones.


If you have absorbent papers, use a 1 0r 2 % gelatine size first. Gelatine at this dilution works perfectly well.


Have a look at the platinum prints on my web site, www.hands-on-pictures.com


Terry





-----Original Message-----
From: Christina Anderson <zphoto at montana.net>
To: The alternative photographic processes mailing list <alt-photo-process-list at lists.altphotolist.org>
Sent: Tue, 20 Jul 2010 16:55
Subject: [alt-photo] Re: Zia standard solutions


Jalo and others,
(Oh my, I'm approaching my ten-post limit for the day)
Jalo's point brought up a topic I have been meaning to ask.  If Jalo just uses 
the 25ml and adds the chemicals, he essentially has just diluted the solution by 
a very teeny amount.  Years ago I read about diluting the combined pt/pd 
solution 50% with water and double coating. This was to get around the very 
absorbent Rives BFK situation.

My question is this:  has anyone diluted the more expensive precious metal 
solutions with water as a general practice, either to save $$, or to deal with 
absorbent papers, or whatnot? I know that if the ratio of ferric to pt/pd goes 
awry, you get a weak print (seen that in workshops), but given the ratios 
staying the same, maybe even a 10% or 20% addition of water to the total mix 
might be possible as general practice? Just wondering if anyone does this, and 
if so, at what point does it not work.  The person in question was double 
coating so it wasn't going to affect the total amount of pt/pd on the paper, so 
I am asking about lessening that total amount.
Chris



Christina Z. Anderson
christinaZanderson.com

On Jul 20, 2010, at 9:47 AM, Christina Anderson wrote:

> Jalo,
> Being consistent with what you do is the most important thing. For instance, I 
used to measure out my dichromate with a gram scale to get exactly a 15% and put 
it in 75ml water and then fill to 100ml.  Now I just add 2 tsp. of dichromate to 
100ml--quick and easy and close enough to a 15%, but because I use it that way 
all the time and have calibrated with that dilution, I have consistency.  But 
gum is more forgiving than other processes.  When I mix my own palladium 
solutions with the powdered palladium, I measure exact and don't sneeze or 
breathe. Once I was mixing $1000 worth of palladium powder for a class and I was 
so freaked I would spill and then have to foot the bill....
> Chris
> 
> 
> Christina Z. Anderson
> christinaZanderson.com
> 
> 
> _______________________________________________
> Alt-photo-process-list | http://altphotolist.org/listinfo

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