Re: Gum : dichromate concentration

On Sun, 30 Nov 2003, Katharine Thayer wrote:

> I can't speak for Judy, but I'll just butt in here to say that within 5
> or so minutes of being in the water, for me the yellow dichromate clears
> completely from the entire print, including borders.
>

Yes, after the first 10 minutes all the dichromate seems to have leached
out, tho the pigment has generally not begun to go. Howwever, I have
never that I can remember suceeded in making a print with only 10 minutes
total development... nor do I want to. My standard development time for
TESTS is one half hour, tho a print is more often an hour up to 24 hours.

In only 10 minutes, aside from lack of definition, the paint is still
bleeding and blurry.

As for the borders -- I mask out the borders these days, but yea or nay I
don't find dichromate stain in normal course of events. Maybe it's the
sweet NYC water.

Judy

> It must not be the gum, because if I remember right you're using the
> same gum I've always used, the Photographers' Formulary powder. But I
> also haven't seen any stain with any of the gums I'm trying out now.
> kt
>
>
>
> Christina Z. Anderson wrote:
> >
> > Has your yellow dichromate stain cleared always from the borders, too?
> > And in 10 or 20 minutes of "development" as well as longer development?
> > Mine never cleared from the borders with the high dichromate concentration
> > unless I potassium metabisulfited it. In reference to cadmium yellow, this
> > is the first time I have experienced clear, brilliant yellow borders and not
> > yellow ochre ones, even when I used to clear it. I know that is a function
> > of exposure, but you have to expose the image area enough to get it to
> > stick, and the borders always were therefore overexposed (I don't mask my
> > borders). So, now, even the borders look good!
> > Chris
>
Received on Mon Dec 1 01:27:53 2003