Re: Black spots in Pt./Pd.

Sandy,
Probably iron contamination, from your tap water or your paper knife,
scissors and etc....
Jacques
----- Original Message -----
From: "Sandy King" <sanking@clemson.edu>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Tuesday, August 09, 2005 12:57 PM
Subject: Black spots in Pt./Pd.

>
>
> Another Pt./Pd.question.
>
> I have not done any Pt./Pd.printing in about 6-8 months and when I
> began trying to calibrate my materials again I ran into a problem
> that I have not seen before, small black spots on the print that
> appear during development.
>
> The chemistry that I am using 1 part of 25% ferric oxalate plus 1
> part of 20% palladium chloride. The solutions are clear and are
> giving very good Dmax, even though they were mixed several months ago.
>
> The paper is Lenox, which I have not previously used for Pt./Pd. printing
>
> Does this sound like a paper issue, chemistry issue, or some type of
> contamination I am not understanding.
>
> Sandy
>
>
>
>
>
Received on Tue Aug 9 10:12:29 2005