Re: Indigo

Though someone here clued me a while back that you can still get genuine
indigo pigment in dry form, there are no paints made with it, and
haven't been any for more than 100 years, which is why the synthetic
pigment that replaced it, PB66, has the name Indigo. The only
manufacturers that use the PB66 are Grumbacher and Schminke. This is a
longwinded way of saying that except for the Grumbacher and Schminke
"indigo" all the paints called "indigo" are mixtures, as Keith pointed
out.
kt

Dave Soemarko wrote:
>
> Actually I forgot whether it is indigo "flower" or indigo "leaves" now. It
> has been a while. When I was studying brush painting long long time ago, my
> teacher had some real indigo color, and he also tried to make some himself
> by using dried indigo plant which he could bought at that time, but he
> wasn't successful in making the indigo color from the dried plant.
>
> The color from the indigo plant was indeed very nice, but the mix from
> (thalo blue + red + black) or (prussian blue + red) can be made similarly
> beautiful.
>
> Dave S
>
> ----- Original Message -----
> From: "Dave Soemarko" <fotodave@dsoemarko.us>
> To: <keith@gumphoto.com>; <alt-photo-process-l@sask.usask.ca>
> Sent: Thursday, January 22, 2004 11:53 PM
> Subject: Re: Indigo
>
> > You could also add a little quinacridone red as real indigo has a touch of
> > red. How much of it is up to your liking. The color of real indigo ranges
> > from purple to violet. In an acidic environment, the flowers are redder,
> and
> > in a more alkaline environment, the flowers are bluer. I believe this is
> the
> > same principle used in lithmus paper also.
> >
> > Of course most "indigo" colors don't use real indigo plant anymore as the
> > manufacturing is complicated yet the color is non-permanent.
> >
> > Dave S
> >
> > ----- Original Message -----
> > From: "Keith Gerling" <keith@gumphoto.com>
> > To: <alt-photo-process-l@sask.usask.ca>
> > Sent: Thursday, January 22, 2004 10:58 PM
> > Subject: RE: Indigo
> >
> >
> > > Indigo is the only pigment I've encountered that flakes whenever I've
> used
> > > it on any kind of paper. I'm probably on record as saying that ANY
> > pigment
> > > can be used with gum, but the truth is I've never had any success with
> any
> > > indigo. Honestly, before I tried indigo, I always wondered what
> "flaking"
> > > was when I heard it discussed regarding gum printing. Someone
> > (Katherine?)
> > > mentioned here that modern indigo contains lamp black. Maybe that
> > > contributes to the problem (although I actually haven't had that many
> > > problems with lamp black on the few occasions I've used it.)
> > >
> > > This is what I do to achieve an indigo type color: mix 1 part pthalo
> blue
> > to
> > > 4-5 parts ivory black. It's very close to indigo.
> > >
> > > -----Original Message-----
> > > From: ericawd [mailto:ericawd@mem.quik.com]
> > > Sent: Thursday, January 22, 2004 9:13 PM
> > > To: alt-photo-process-l@sask.usask.ca
> > > Subject: Indigo
> > >
> > >
> > > I am having trouble with achieving the right gum/pigment mix with
> > indigo.
> > > I work with gram(s) pigment to ml(s) gum ratios. (e.g.. Windsor Blue 1
> > > gram to 12 ml). I have tried more than one mix and none have come out
> > > satisfactory.
> > >
> > > Does anyone use WN Indigo and if so what ratio worked?
> > >
> > > Candace Spearman
> > >
> > >
> > >
> > >
> > >
> >
Received on Thu Jan 22 23:12:43 2004