Re: yellow pigment for gum

Katharine Thayer wrote:
>
 With transparent pigments, you don't see a
> separate layer on top, you don't see any separate layers, you see only
> the blended color. Hope that's more "clear."

Still trying to think of a better way to convey this. For example, I'm
looking at a cadmium red printed over pthalo. When I look at it, I see
the cadmium red on top; I see the pthalo below, and I see how by looking
"through" the red to the blue you visually make a purple. But the first
thing you see is the red; being an opaque pigment it "covers" the blue
(not of course completely, since there's a lot of gum in it, but rather
like a veil or an overlay). But the layers are separate layers,
visually. I'd scan this but I'm not sure it's something you could see
electronically. The red is definitely a separate layer on top of the
blue. If you put a more transparent red pigment over pthalo, you would
still have, physically, separate gum layers, but you wouldn't *see* them
as separate layers, you'd just see a transparent purple. If anyone's
interested in reading more about transparency vs. opacity in gum prints,
see my page (scroll down to Transparency v opacity).

http://www.pacifier.com/~kthayer/html/pigment.html
kt

Katharine
Received on Mon Jun 6 13:00:00 2005