John Weber on fri 8 feb 02
Llewellyn, here is one we were given in a workshop that we have used and
gives a fairly nice purple matt in reduction at closer to Cone 10. I think
it is a bit light in silica, but it is a matt which usually are lighter in
silica. This might be the time to start a discussion with Ron and John about
whether the principals in their book can be applied to Cone 10 by simply
adjusting for the limits from Cone 6 to 10, but keeping the fluxes the same.
==========================
Cone 10 Reduction - Purple matt
=========================
Whiting 24
Custer feldspar 61
EPK 15
==========================
Green chrome oxide 1
Cobalt carbonate 0.5
Rutile 5
Bentonite 2.5
==========================
Na2O 0.09 Al2O3 0.47 SiO2 2.41
K2O 0.19 P2O5 0.00
MgO 0.01 TiO2 0.16
CaO 0.70 Cr2O3 0.02
CoO 0.01 Fe2O3 0.01
Alumina:Silica ratio is 1.00:5.14
Neutral:Acid ratio is 1.00:5.56
Alk:Neut:Acid ratio is 1.00:0.47:2.61
Expansion: 90.3 x 10e-7 per degree C
=============================================
> -----Original Message-----
> From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.CERAMICS.ORG]On
> Behalf Of Llewellyn Kouba
> Sent: Thursday, February 07, 2002 10:31 PM
> To: CLAYART@LSV.CERAMICS.ORG
> Subject: Re: Looking for a Matte Purple and blue cone 9
>
>
> Thank you Beth,
>
> for the glaze formula cone 9-10 range but I should have included in my
> original post...searching for something without Colemanite (which I don't
> have) or Gerstely borate....same problem. Unless I get around to
> retesting
> some of the subs again? I have had two sessions with that but has been on
> hold again along with many other chores. :)
> Llewellyn
>
>
> At 04:03 PM 2/7/2002 -0800, you wrote:
> >Emily Purple is nice. Here it is from the archives:
> >
> >Here's a ^9 "Emily G. Purple" I used to use 15 years ago. Maybe
> >it is the same one you are looking for. It has a wonderful buttery
> >texture and is very purple.
> >
> >Potash Feldspar 410.0
> >Colemanite 120.0
> >Dolomite 70.0
> >Talc 150.0
> >Tenn. Ball Clay 50.0
> >Flint (Silica) 200.0
> > _______
> > 1000.0 gms
> >Cobalt Oxide 2%
> >Bentonite 2%
> >Tin 2%
> >Beth
> >Sun & Moon Pottery
> >Tallahassee, FL
> >
> >----- Original Message -----
> >From: "Llewellyn Kouba"
> >To:
> >Sent: Thursday, February 07, 2002 12:26 PM
> >Subject: [CLAYART] Looking for a Matte Purple and blue cone 9
> >
> >
> > > I am getting ready to fire a glaze kiln and a client wants a blue tea
> > > set. Does anyone have a nice purple/ and or blue matte that they
> >would
> > > like to share? (cone 9 gas reduction on stoneware and porcelain) I
> >will
> > > also check out the archives.
> > > Thanks
> > > Llewellyn
> > >
> > >
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> > >
> >
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