[Alt-photo] Re: casein and Ferrari red

[Guido Ceuppens]

Christina,
I have used casein with powder pigments and acrylic paints but never with
aquarelle paints. I never saw the curdle or coagulation of the casein as
you described. I have always used powder casein (different
manufacturers/sources,
but now Kremers) made up with ammonium carbonate, borax and lately simple
household ammonia. I keep the casein mixture for not longer than about 3
days (it's so easy to mix) and the mix of pigment/paint, casein and
dichromate for about 24 hours.

Guido


2013/5/14 Marek Matusz <marekmatusz at hotmail.com>

> Kees,
>
> I use same type of casein mixed from powder and ammonium carbonate with a
> fair amount of preservative.
>
> Marek
>
>
> > From: workshops at polychrome.nl
> > Date: Tue, 14 May 2013 13:46:17 +0200
> > To: alt-photo-process-list at lists.altphotolist.org
> > Subject: [Alt-photo] Re: casein and Ferrari red
> >
> > Hi Chris,
> >
> > Tried Kremer XSL irgazin red PR 254 (powder igment) in casein. No
> problems!
> > My casein mix is from casein powder with ammoniumcarbonate.
> >
> > Kees
> >
> >
> >
> >
> > On 13 mei 2013, at 18:30, Christina Anderson <
> christinazanderson at gmail.com> wrote:
> >
> > > Dear All,
> > > I have been working on a body of casein prints. Today I decided to use
> some PR254, that beautiful Ferrari Red (Daniel Smith Pyrrol Red, Da Vinci
> Red, Maimeri Sandal Red, M.Graham pyrrol red, Rembrandt permanent red deep,
> Schmincke scarlet, Sennelier red, Winsor red are some brand names). Works
> great with gum for a brilliant lipstick red.
> > >
> > > I mixed it up with my casein and it was instant curdle/coagulation of
> the casein! No problem at all with the usual colors, but with the metal
> salts as has been discussed on the list you can work with them but stock
> solutions will lump up in a brief time into insoluble chunks so I never mix
> stock casein anymore once I learned that lesson. However, with nickel azo
> yellow, for instance, one of my favorite yellows that lumps up, I can still
> use it if I mix it up right at time of use. Same with red iron oxide.
> > >
> > > But PR 254 is diketo pyrrollo-pyrole. Don't have any idea why that
> would make this happen instantly. Does anyone have a guess why this pigment
> causes instant coaglulation and precipitation of the casein??? Is it just
> an acidity thing or is it a metallic salt? It precipitated the casein into
> squishy curds. Never seen this happen so rapidly before...
> > >
> > > Any other casein printers experience colors that coagulate, or want to
> pull out their PR254 and see this happen? If you have, what colors?
> > > Chris
> > >
> > >
> > > Christina Z. Anderson
> > > christinaZanderson.com
> > >
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