Re: Platinum/Palladium & Paper Speed

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 05/29/06-12:07:57 PM Z