Re: "Split-tone" with gum.

And in fact if this were the principle behind the effect, then it
seems to me the highlights would be red rather than blue or green,
since the PR 101 is a very sedimentary, granulating pigment and both
pthalos are not at all. So the reasonable expectation would be that
the PR 101 would settle down into the paper and be a definite factor
in the color of the highlights, rather than not being there at all,
and only the blue or green showing. So the explanation for the split-
tone effect has to be something other than separation of pigments
because of the settling quality of one of the pigments.
Katharine

On Jul 11, 2006, at 9:02 AM, Katharine Thayer wrote:

>
> On Jul 11, 2006, at 8:12 AM, Christina Z. Anderson wrote:
>
>
>> I don't know if this is what is happening in your case (probably
>> not) but the terms we used were that certain colors in mixture
>> flocculate, granulate, and/or separate from each other. With
>> granulation they separate into the hollows of the paper,
>> flocculation has to do with electrostatic charge they seem to
>> think...but in watercolor practice this was a technique to
>> exploit, especially in wash effects. It happens beautifully with
>> the phthalos mixed with reds to create a deep shimmery green black.
>>
>> Granulation also means some pigments will look grainier in gum
>> printing because of their tendency to settle or clump.
>>
>
>
> Yes, as I explain on my website, a printer who understands her
> pigments well can exploit the tendency of some colors in mixtures
> to settle out etc, and I've done some interesting things by so
> exploiting the characteristics of pigments in mixtures. But no, I
> don't think that's what's happening in this case. There's no
> granulation or flocculation, just a split-tone look where the color
> in the highlights is different than the color in the shadows and
> midtones.
> Katharine
>
Received on 07/11/06-10:55:03 AM Z