Re: Platinum/Palladium & Paper Speed

Hi Eric,

All good questions, but I am referring to just differences in paper speed
given all other variables are held constant. I'm not asking because it is a
problematic issue for me, my question is just out of curiousity. What factors
affect the speed of different papers? Now that I think of it, I think DIck
Arentz has some reference to this in Platinum & Palladium Printing, Second
Edition, I'll read that and report back. But in the meantime, are there other
processes where all variables kept constant, except paper, where different papers
exhibit different speeds?

Thanks!

Best Wishes,
Mark Nelson
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In a message dated 5/29/06 1:24:13 PM, e.neilsen@worldnet.att.net writes:

>
> Mark, One of the primary chemicals that is part of the process is water. I’d
> check to see how it is being affected by the procedures being used. Was the
> paper humidified before exposure? What type of contact frame was used to make
> the exposure? Vacuum or split back? Sealed unsealed with regard to a vapor
> barrier between the glass/neg/paper/backing? Heat level during exposure?
>  
> Which of these inhibit the movement of water, and which accelerate or
> facilitate it? Is it localized?
>  
> And then there is the light source…  or UV rays…  How are they passing
> through the paper? During exposure as well as after when the image is formed and
> being revealed to the eye as a reflected image?
>  
> If it were true in other processes, are they also using FO, and/or AFO?
>  
> Have you put this question to Mike Ware? He at least did some scientific
> study of the PT/PD process which was published years back. Perhaps, he can give
> you some additional insights.
>  
> Eric  
>
Received on 05/29/06-12:34:33 PM Z