Re: Yellow pigment stain: (Was: Re: Sodium Bisulfite

Thanks,
How do you know mine was not yellowish-brown-purple? But everybody calls it
"yellow" stain.
For some reason I never had problems with monochrome and bichromate stain
and I pick up the wrong concentration from photoformulary website (it's the
second time I pickup errors in their website, the first time I call them on
the phone).
I was actually spraying it with a 1,2% for 1 minute.
Thanks again,
Giovanni
pd Can you instruct me on "pigment stain"? How can it happen when there is
no light? My paper is Begger 300 gr. and my pigment manufacturer is
"Maimeriblu".

----- Original Message -----
Wrom: NNYCGPKYLEJGDGVCJVTLBXFGGMEPYOQKEDOTWFAOB
To: <alt-photo-process-l@sask.usask.ca>
Sent: Tuesday, August 24, 2004 6:17 AM
Subject: Yellow pigment stain: (Was: Re: Sodium Bisulfite

> gdimase@hotmail.com wrote:
> >
> > Hi Katharine,
> > I assume the sodium bisulfite is on a 12% concentration.
> > How much time you put the picture in the bath?
> > An the you bath it again in a water bath, for how long?
> > What about stubborn cases? You keep it longer?
> > Let me give you a recent example of what happened to me:
> > I was working on a full color print, this picture has an open clean
white
> > sky therefore the negative section of the sky is totally black.
> > I did my first cyano print and everything was fine (sorry I sized the
day
> > before first with gelatin and glyoxal).
> > I go next day for my Blue channel and yellow pigment and the sky comes
out
> > "yellow", I thought it was stained, next day I did my Green channel and
> > magenta pigment and I got a beautiful picture but with the yellow sky
(as I
> > said out of a black negative).
> > I wash it with sodium bisulfite and the stain is still there.
> > Yes, I know I can create a new negative and paint the sky on white but I
> > want to know what may have happened.
>
> Hello Giovanni,
> That's almost certainly pigment stain, not dichromate stain--- a
> different issue entirely. I don't mean to discourage you, but it may be
> less frustrating for you in the long run to master monochrome printing
> before attempting tricolor, at least that's the sequence many people
> find most rewarding for gum printing.
>
> Yes, I suppose you could print opaque white over your stain, but I doubt
> the result will be the same as the result you would get by printing in
> color on white paper.
>
> Katharine Thayer
>
Received on Tue Aug 24 15:02:36 2004