Richard Aerni on fri 8 feb 02
John
I believe that John got this recipe from one of my workshops. I call it
Dick Lehman Pink/Purple Matte, since it came from a Dick Lehman CM article
called "Steal This Glaze." Notice that the title is PINK purple matte. It
goes more pink than purple for me. Emily's Purple, quoted earlier, is
really, really purple!
You might try taking a matte or semi-matte recipe, delete the whiting and
substitute for it half talc and half dolomite. Then for colorants add 1.5-2
% Cobalt Oxide, and 2 % Tin Oxide. Those coloring oxides, in combination
with the magnesium, should give you a purple glaze.
Hope this helps,
Richard Aerni
Bloomfield, NY
----- Original Message
From: "John Weber" <>
To:
Sent: Friday, February 08, 2002 5:01 AM
Subject: Re: Looking for a Matte Purple and blue cone 9 and ? for Ron & John
> 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
> =============================================
John Weber on sat 9 feb 02
John
Richard, you are absolutely correct, I did get this glaze from your
workshop. THANKS, it works great! However, I wanted to ask you about your
comment here. Would it not be Chrome rather than cobalt to mix with Tin to
get purple? I am testing glazes today so I'll check out, but I wanted to
ask. Thanks for your great workshop, do more and we'll attend.
> -----Original Message-----
> From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.CERAMICS.ORG]On
> Behalf Of Richard Aerni
> Sent: Friday, February 08, 2002 12:36 PM
> To: CLAYART@LSV.CERAMICS.ORG
> Subject: Re: Looking for a Matte Purple and blue cone 9 and ? for Ron &
> John
>
>
> I believe that John got this recipe from one of my workshops. I call it
> Dick Lehman Pink/Purple Matte, since it came from a Dick Lehman CM article
> called "Steal This Glaze." Notice that the title is PINK purple
> matte. It
> goes more pink than purple for me. Emily's Purple, quoted earlier, is
> really, really purple!
> You might try taking a matte or semi-matte recipe, delete the whiting and
> substitute for it half talc and half dolomite. Then for
> colorants add 1.5-2
> % Cobalt Oxide, and 2 % Tin Oxide. Those coloring oxides, in combination
> with the magnesium, should give you a purple glaze.
>
> Hope this helps,
> Richard Aerni
> Bloomfield, NY
> ----- Original Message
> From: "John Weber" <>
> To:
> Sent: Friday, February 08, 2002 5:01 AM
> Subject: Re: Looking for a Matte Purple and blue cone 9 and ? for
> Ron & John
>
>
> > 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
> > =============================================
>
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