[alt-photo] Re: Zia standard solutions

[Paul Viapiano]

Yep, that was me. It worked beautifully and gave me the best argys I have 
ever made.


----- Original Message ----- 
From: "Loris Medici" <mail at loris.medici.name>
To: "The alternative photographic processes mailing list" 
<alt-photo-process-list at lists.altphotolist.org>
Sent: Tuesday, July 20, 2010 9:11 AM
Subject: [alt-photo] Re: Zia standard solutions


>I don't think there's a definitive answer to that. For instance, I remember 
>Sam Wang suggesting dilution of argyrotype soln. 1+1 with water (for some 
>specific reason which I can't remember right now) and someone tried it (was 
>it Paul Viapiano?) and got better results, "for his set of parameters". I 
>guess one has to test and see if dilution (w/o affecting stoichiometric 
>balance!!! That is, w/o affecting the molar equivalence between the 
>compounds involved) works for them.
>
> Regards,
> Loris.
>
> On 20.Tem.2010, at 18:55, Christina Anderson wrote:
>
>> 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.
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