Re: Black spots in Pt./Pd.

Kerik,

The Lenox was purchased from a different source, and over a lapse of
several years. I have run some more tests and it now looks to me that
the problem is caused by abrasion (likely), or contamination, rather
than particulates in the paper, though I won't be able to verify this
until I get the new Richeson. Every other small brush I have on hand
at the moment either abrades or is suspect because of previous use
with other processes.

Curiously, I have never had any problem with the Clearprint Vellum.

Sandy

>Sandy,
>
>Where did you get your Lenox and is it the same supplier you bought
>from before?
>
>I've always assumed it's some kind of fine particulate iron
>contamination in the paper. And it varies from batch to batch over
>time. I had this issue with Clearprint Vellum. When I first started
>working with it I had ZERO black spots. After that batch was used
>up, I couldn't seem to find a clean batch again. Very frustrating
>because this paper was PERFECT (in every other way) for my high-key
>foggy images where any black spots stick out like sore thumbs.
>
>I've also had black spot issues come and go with Arches Platine over
>the years.
>
>I don't know of any way to prevent them. Perhaps first sizing the
>paper would help, but I doubt it. Do you have lots of spots or just
>a few per print? If they aren't too bad, you can remove them using
>Michael Mutmansky's bleaching technique using dilute HCl and bleach.
>This procedure was outlined on the B&S webboard several months back.
>
>Contact me offlist if you want more info.
>
>Kerik
>
>>I just tried another paper and did not have the black spots.
>>
>>So what causes this, and is there any way to avoid it. I have a
>>hundred sheets of this Lenox that I planned to use for palladium
>>printing and hate to think that it will be no good. The last batch
>>of Lexon I had printed beautifully.
>>
>>Sandy
Received on Tue Aug 9 11:24:15 2005