Re: Platinum/Palladium & Paper Speed

Hi Loris,

Thanks for your response.

Absorption sounds like a possibility too. How bout paper thickness?
Sizing?

Best Wishes,
Mark Nelson

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In a message dated 5/29/06 1:08:46 PM, mail@loris.medici.name writes:

> Hi Mark,
>
> I won't approach this issue from the pt/pd perspective:
>
> I think apart being chemical (undoubtedly paper's chemistry has great 
> effect over the results), it may also be strongly related to 
> absorbtion - more absorbent papers being slower. What is your 
> experience with contrast? I mean; have you found that slower papers 
> exhibit consistently lower or higher contrast? (I'd bet for: 
> "consistently higher contrast")
>
> My logic is based on my classic (and new) Cyanotype experience: when 
> you double coat the speed drops and contrast increases... Double 
> coating = using more sensitizer per given coating area -> absorbent 
> paper also uses more sensitizer per given coating area... FWIW, my 
> exposure times are more or less the same for 4 or 5 different papers I 
> have used since I started making Cyanotypes and I always double coat 
> classic cyanotypes (single coat new cyanotypes) + I always use the 
> same amnt. of sensitizer per given coating area (lightsource is the 
> same).
>
> Just my 2 cents.
>
> Regards,
> Loris.
>
> ----- Message from Ender100@aol.com ---------
>     Date: Mon, 29 May 2006 12:42:24 -0400 (EDT)
>     From: Ender100@aol.com
> Reply-To: alt-photo-process-l@usask.ca
> Subject: Platinum/Palladium & Paper Speed
>       To: alt-photo-process-l@usask.ca
>
> > Has anyone proposed a reason why some papers print faster or slower
> (shorter
> > or longer exposure times) than others when printing with
> Platinum/Palladium?
> >
> >
> > It would seem to be some chemical related issue, such as buffering
> or ph of
> > the paper, but I am only guessing.
> >
> > I would assume this is also true for many other processes?
> >
> > Can anyone suggest a reading reference on this?
> >
> > Thanks in advance.
> >
> > Best Wishes,
> > Mark Nelson
>
Received on 05/29/06-12:38:11 PM Z