Re: Problem pigment

From: Katharine Thayer ^lt;[email protected]>
Date: 06/03/05-07:01:50 AM Z
Message-id: <>

davidhatton wrote:
> Hi,
> for what it's worth, I've had a similar problem (amongst a myriad
> others)! It almost looks as if the stain has formed the steps and the
> pigment has totally washed off.

David, I can't say what's happening in your case, but in this particular
case, it's not that the pigment (and the gum) has washed off and left a
stain behind. Here, the gum and pigment are very much there, as thick
as ever, but the pigment has just turned this weird color. And perhaps
it wasn't completely apt to call it a stain in that one case where I was
calling it a stain, but I don't know what else to call it, since it
didn't clear off the highlight steps.

No, that's not "how gum is," at least not in my experience.

And I use several other bright reds without anything like this
happening. I think we're probably talking about two different things,

This is one of the reasons I've been
> stepping up my exposures (to no avail - I use the big light in the
> middle). Problem is it happens to many colours not just reds..
> I was beginning to think that 'this is how gum is'...
> Regards
> David Hatton
> Katharine Thayer wrote:
> >Chris asked a while ago about pigments people have had problems with. I
> >said I hadn't had a problem with any pigment except for zinc oxide in a
> >gouache getting dichromate stain. Well, you know what they say about
> >pride goeth before a fall -- I believe I've now met my match in cadmium
> >red. I would never actually print with this pigment, because it's too
> >opaque for my taste, but I bought it the other day because I wanted to
> >test out this question about reflectance curves and color mixing by
> >overlaying layers of color, since no one answered my question the other
> >day.
> >
> >But, this pigment (as M. Graham Cadmium Red) prints totally weird. It's
> >a beautiful clear medium red in the paint, but in the gum print it's the
> >dullest, ickiest terra cotta color you ever saw. And on one paper-size
> >combination it stained, although as a rule I never see pigment staining.
> >Here's some examples of what it looks like:
> >
> >
> >
> >kt
> >
> >
> >
> >
> >
> >
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Received on Fri Jun 3 13:57:41 2005

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