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

Thanks.
Let me say that working with cyanotype there is not need to work with the
the cyan pigment amount, then it comes the yellow pigment standard 2 grms
and what I do for the magenta is to check it during development usually I
develop a little bit shorter on the water, meaning doing it by sight.
Could you or anybody illustrate me on the concept of different amount of
pigments for coating?
Giovanni

----- Original Message -----
From: "Katharine Thayer" <kthayer@pacifier.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Wednesday, August 25, 2004 11:22 AM
Subject: Re: Yellow pigment stain: (Was: Re: Sodium Bisulfite

> gdimase@hotmail.com wrote:
> >
> > Yes, I always use 2 grms of pigment with 6 cc of gum arabic and 6 cc of
> > potassium dichromate and everything came from the same bottle and the
same
> > tube.
>
> Then I'd agree with Judy that the pigment stain may be related to
> sizing. But I hope you don't mean that you always use the same amount of
> pigment even with different pigments; doing that will give you very
> uneven results. The amount of pigment should be adjusted for the
> particular pigment, as different pigments (and different brands of the
> same pigment) vary widely in pigment strength and in how much pigment
> there is in the tube.
> Katharine
>
Received on Wed Aug 25 20:58:45 2004