Keith Schreiber (firstname.lastname@example.org)
Mon, 28 Jun 1999 16:04:33 -0700
This sounds very much like what I encountered with several papers that I
have tested for traditional Pt/Pd. With many of the papers, including Rives
BFK, close examination with a loupe or magnifier showed that the white spots
were usually naked fibers, that is fibers that did not absorb the solution.
In some cases adding a bit of Tween 20 alleviated the problem (Gampi,
Twinrocker WC) but in others (including BFK) it didn't.
Looking at your message again, I see that you wrote "RBK Rives". Is this a
typo? I have heard of RKB (R.K. Burt) Rives, but not RBK.
Anyhow, have you previously used this paper for Ziatypes without
experiencing this problem?
> since recently, I have a new problem which has not occured before:
> in some of my prints, and this means Ziatypes as well as Chrysotypes, and,
> if I remember correctly, with and without Tween, I get tiny white spots
> quite evenly distributed in the shadow areas. They are enough to reduce
> dmax somewhat. They look as if tiny air bubbles would have prevented
> exposure, or give a "spongy" impression (this is only to describe my
> I got them on RBK Rives (Ziatypes) as well as on Whatman Watercolour
> I really have no clue about the origin of this problem; does anybody have
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