U of S | Mailing List Archive | alt-photo-process-l | Re: tri-color gum at last

Re: tri-color gum at last

Hi, Loris and Keith,

This is fairly close to the combination that I give on my site as
being the closest approximation I've found to "process" colors; the
only difference is the yellow. I've never liked printing with PY
151; it's too light a yellow for my taste; I prefer PY 97 for a
primary yellow. But it turns out PY97 is at the same axis on the
color wheel (same hue) as PY151, but a deeper value. Otherwise same
as yours: PV19 gamma ( quinacridone rose) and thalo green shade (PB
15:3). This combination produces strong primaries and secondaries
and neutral greys and blacks. I don't care for the greens much; the
thalo gives greens that seem "unnatural" to my eye, so this isn't
the combination I generally use for my own work, especially
landscapes, besides I prefer a less saturated color palette. But
this is the combination that I've found in experimenting gives a
good approximation to process colors.

My old favorite combination, PY110, PR 175, and ultramarine, also
produced very deep rich blacks and neutral greys, with a somewhat
unsaturated color palette.

BTW, Daniel Smith calls their version of PV 19 "quinacridone red"
rather than quinacridone rose, which is unfortunate and confusing,
and I wish they wouldn't. Quinacridone red is PR 209, a different
pigment that has more of a yellow cast than the bluer PV19.

On Sep 25, 2008, at 4:11 AM, Loris Medici wrote:

Hi Keith,

My current pigment choice looks promising in getting neutral and dark
blacks. Maybe it's too early to decide (because I still haven't
manage to
balance the pigments), but the ruined prints have nice deep "neutral
looking" blacks (not too brownish or too purplish) with the pigments

Cyan : PB15:3 - Phtalocyanine Blue
Magenta: PV19 - Quinacridone Red
Yellow : PY151 - Benzimidazolone
(All semi-transparent, semi-staining pigments)

Have you tested these together before? If yes, I'd like to hear your


24 Eylül 2008, Çarşamba, 6:44 pm tarihinde, Keith Gerling yazmış:

Even more impressive then. That is a very neutral and dark black.
I've resorted to using cyanotype for the very reason that I did not
think I could get blacks like that with 3 primary color gum coats. I
better get back to work on that!

Can I pester you some more? What blues did you use? What kind of

On Wed, Sep 24, 2008 at 9:16 AM, henk thijs <henk.thijs@hetnet.nl>

Hi Keith,
No , just the standard:
Yellow (a primary), magenta (magenta from the tube with a bit
maron) and a mix of blue 's ...

On 24 sep 2008, at 15:24, Keith Gerling wrote:

wow - isn't it great when you can obtain such nice and subtle skin
tones?  Very nice.

Gum over Cyanotype?