[alt-photo] Re: dilution of pt/pd

[Paul Viapiano]

All I can tell you is I've done it and it works...it's just a very basic 
general guideline.

I haven't talked to Stan about this issue personally, and don't know if he's 
changed anything since the book. Of course, the usual caveats for different 
paper, humidity, etc all apply.

Some people have reported solarization as Clay has...but my guess is that 
you can add a bit of water to the coating solution as long as you don't 
overdo it to get it to brush on a bit smoother.




----- 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: Thursday, July 22, 2010 9:15 AM
Subject: [alt-photo] Re: dilution of pt/pd


> Hmmm...I'm not sure what I am misunderstanding--50% of 12ml would only be 
> 6ml, and he is adding 7.5. Am I reading you wrong?
>
> OH, I think we're talking apples to oranges, because I mean 50% of the 
> original volume, not 50% of the final volume.
>
> Interesting that he is adding 50% of the initial volume in water to 3ml, 
> less than 50% to 8, more than 50% to 12. I wonder what he has found to 
> make that variance. Ratio of water to total final volume being from 30-38% 
> which I suppose is not that big of a deal--maybe. I mean, a variance of 
> 8%.
>
> Chris
>
> Christina Z. Anderson
> christinaZanderson.com
>
> On Jul 22, 2010, at 10:48 AM, Paul Viapiano wrote:
>
>> No, Christina...I said starting at 12ml.
>>
>> He adds 1.5ml to 3ml to get 4.5ml, adds 3.5ml to 8ml to get 11.5ml, adds 
>> 7.5ml to 12ml to get 19.5 ml
>>
>> That's what his chart in the book indicates..he also said these are 
>> guidelines to check out, if I recall.
>>
>> p
>>
>>
>> ----- 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: Thursday, July 22, 2010 6:35 AM
>> Subject: [alt-photo] Re: dilution of pt/pd
>>
>>
>>> This is interesting, Paul. Thanks.
>>>
>>> Wow, when he gets up to 12ml he's adding over 50%?? Does he say he is 
>>> double coating then?
>>> Chris
>>>
>>> Christina Z. Anderson
>>> christinaZanderson.com
>>>
>>> On Jul 21, 2010, at 4:53 PM, Paul Viapiano wrote:
>>>
>>>> In the appendix of the Arentz book, Stan Klimek says that he extends 
>>>> the platinum solution by adding distilled water.
>>>>
>>>> It's my understanding that he doesn't extend the solution if he's using 
>>>> less than 3ml of total solution (FO + pt). But starting at 3ml he 
>>>> extends by adding 1.5ml distilled H20, 8ml by adding 3.5ml, 12ml by 
>>>> adding 7.5 ml.
>>>>
>>>> He states that this wetter solution makes for a smoother coat.
>>>>
>>>> I believe he also states that his pt/pd ratio is 1:5.
>>>>
>>>> Paul
>>>>
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