Re: tri-color gum at last

[Katharine Thayer <kthayer@pacifier.com>]

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.
Katharine

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
> below:
>
> 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
> experience.
>
> Regards,
> Loris.
>
>
> 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  
> > negs?
> >
> >
> >
> > On Wed, Sep 24, 2008 at 9:16 AM, henk thijs <henk.thijs@hetnet.nl>  
> > wrote:
> >
> > > Hi Keith,
> > > No , just the standard:
> > > Yellow (a primary), magenta (magenta from the tube with a bit  
> > > Pirylene
> > > maron) and a mix of blue 's ...
> > > Cheers,
> > > Henk
> > >
> > > 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?