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

Christina Anderson zphoto at montana.net
Thu Jul 22 16:15:18 GMT 2010


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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