Chris Schafale on wed 24 nov 99
Hi Sue,
You asked for it. Don't blame me when it takes forever to mix. As I
said before, I suspect one could simplify this quite a lot and still
have it work, but I haven't taken the time to do the tests, since I
still have a decent bucketful of the original. I fire this to cone
5, not 6, because it's apt to get blisters/small craters if fired too
hot.
IMCR 6040 (Burgundy Satin)
==============================
EPK KAOLIN.......... 4.25
KT 1-4 BALL CLAY.... 5.90
SILICA.............. 31.60
GERSTLEY BORATE .. 16.00
G 200 FELDSPAR...... 4.50
CUSTER FELDSPAR..... 2.00
F-4 FELDSPAR........ 11.50
TALC................ 9.00
DOLOMITE............ 7.75
WHITING............. 0.90
BONE ASH............ 6.60
SPANISH RED IRON OX. 13.00
========
113.00
CaO 0.50* 10.51%
MgO 0.38* 5.76%
K2O 0.04* 1.51%
Na2O 0.08* 1.88%
TiO2 0.00 0.12%
Al2O3 0.21 7.89%
B2O3 0.21 5.51%
P2O5 0.06 3.37%
SiO2 2.79 63.12%
Fe2O3 0.01 0.33%
Si:Al 13.57
SiB:Al 14.60
Expan 5.87
> ----------------------------Original message----------------------------
> Chris,
> Would you mind posting the Burgandy Satin glaze again? I have the RR
> Black but missed the Burgandy. Your Exciting Black sounds wonderful
>
> Sue Beach
> sbeach@iquest.net
>
> Chris Schafale wrote:
> >
> > ----------------------------Original message----------------------------
> > In view of recent posts on black and red glazes, and the slightly
> > less recent posts about what happens with scrap/mixed glazes,
> > thought I'd share this. Some of you remember (some of you were even
> > brave enough to try) the red glaze ("Burgundy Satin") I posted some
> > months ago (the one that resulted from mixing 5 different glazes
> > together and had 13 ingredients.) And you've all heard of RR's
> > wonderful black.
> >
> > Well, just for fun, I mixed some of RR's black with some of my red
> > glaze. Got this extremely cool glaze that reads black from across
> > the room, but close up has "floating" greenish specks where thicker
> > and a deep almost-red brown where thinner over throwing rings. Has a
> > lot of visual depth. Stable, applies nicely, fires beautifully,
> > doesn't run, crawl, or craze. And I sold everything I had in that
> > glaze this weekend in two shows. Unfortunately, if you do the
> > calculations to put it together from scratch, it has 15 ingredients!!
> > Not for the faint-hearted, nor can I guarantee it would turn out the
> > same for anyone else.
> >
> > So, for those of you who have both RR black #2 and Burgundy Satin
> > (aka IMCR 60-40) on hand (hi Barney!), have a ball! Start with 3
> > parts by volume of the black and add 1 part red. Apply fairly thin
> > if you don't want too much green. I'm also going to try a somewhat
> > smaller amount of red next time. Don't mix a lot at once, you may
> > hate it. If you love it, call it Exciting Black, as I do.
> >
> > Chris
> >
> > Light One Candle Pottery
> > Fuquay-Varina, NC
> > candle@intrex.net
>
>
Light One Candle Pottery
Fuquay-Varina, NC
candle@intrex.net
John Post on thu 25 nov 99
Hi Sue and Chris,
Here are a couple of revisions to the glaze Chris posted. Both have fewer
ingredients. The second one uses frits instead of feldspar and gerstley to
get more clay into the recipe providing a better working slurry. I used
OM4 as the ball clay in my calculations. I increased the expansion just a
bit in both revisions. (This glaze base without the iron has very low
expasion, around 60.0 x 10e-7 per degree C.) If you decide to test either
of these revisions, let us know how they workout.
(All these glazes are cone 5-6 oxidation.)
John Post
+++++++++++++++++++++++
+++ IMCR 6040-1 +++
+++++++++++++++++++++++
Date: 11/24/99
Gerstley borate 16.6
Bone ash 6.8
Custer feldspar 19.9
Wollastonite 7.1
Talc 14.6
EPK 9
Flint 26
--------
100
Red iron oxide 13
===========================
Chemical Analysis
===========================
Na2O 0.06 Al2O3 0.21 SiO2 2.82
K2O 0.06 B2O3 0.16 P2O5 0.06
MgO 0.38 Fe2O3 0.24
CaO 0.50
Alumina:Silica ratio is 1.00 : 13.47
Neutral:Acid ratio is 1.00 : 8.38
Alkali:Neutral:Acid ratio is 1.00 : 0.37 : 3.11
Expansion coefficient: 70.0 x 10e-7 per degree C
Oxides causing abnormal expansion effects: B2O3
+++++++++++++++++++++++
+++ IMCR 6040-2 +++
+++++++++++++++++++++++
Date: 11/24/99
Frit 3110 15.1
Frit 3134 15
Bone ash 6.6
Wollastonite 4.7
Talc 16
EPK 17.9
Flint 24.7
--------
100
Red iron oxide 13
===========================
Chemical Analysis
===========================
Na2O 0.17 Al2O3 0.21 SiO2 2.87
K2O 0.01 B2O3 0.15 P2O5 0.05
MgO 0.35 Fe2O3 0.22
CaO 0.47
Alumina:Silica ratio is 1.00 : 13.87
Neutral:Acid ratio is 1.00 : 8.78
Alkali:Neutral:Acid ratio is 1.00 : 0.36 : 3.14
Expansion coefficient: 72.3 x 10e-7 per degree C
Oxides causing abnormal expansion effects: B2O3
The original recipe...
+++++++++++++++++++++
+++ IMCR 6040 +++
+++++++++++++++++++++
Date: 11/24/99
EPK 4.25
Kentucky OM #4 5.9
Flint 31.6
Gerstley borate 16
G-200 4.5
Custer feldspar 2
Kona F-4 11.5
Talc 9
Dolomite 7.75
Whiting 0.9
Bone ash 6.6
--------
100
Red iron oxide 13
===========================
Chemical Analysis
===========================
Na2O 0.08 Al2O3 0.21 SiO2 2.83
K2O 0.04 B2O3 0.16 P2O5 0.06
MgO 0.38 TiO2 0.00
CaO 0.50 Fe2O3 0.25
Alumina:Silica ratio is 1.00 : 13.78
Neutral:Acid ratio is 1.00 : 8.54
Alkali:Neutral:Acid ratio is 1.00 : 0.37 : 3.14
Expansion coefficient: 69.8 x 10e-7 per degree C
Oxides causing abnormal expansion effects: B2O3
John Post
Sterling Heights, Michigan
rp1mrvl@moa.net
Ron Roy on sat 27 nov 99
Hi Chris,
I couldn't resist making this a simpler glaze - if you try it let me know
how close I got. By the way - you don't seem to have an analysis for
spanish iron in your MDT - you could have used any analysis or asked for
one on ClayArt - I am sure there is one around. Or did you leave it out for
some reason - the Fe2O3 should be up around .23 mols.
Frit 3134 - 20.0
G200 spar - 7.0 (or Custer)
Talc - 10.5
Dolomite - 9.5
Bone ash - 6.0 (tricalcium phosphate will probably work)
KT#1-4 - 4.0 (Old Mine #4 will work just fine)
EPK - 13.0
Silica - 30.0
Spanish iron - 13.0 ( other irons may work just as well)
Total 113.0
Ratio - 13.28 ( original is 13.41)
Expansion RR style - 477.77 ( 480.41)
>----------------------------Original message----------------------------
>Hi Sue,
>
>You asked for it. Don't blame me when it takes forever to mix. As I
>said before, I suspect one could simplify this quite a lot and still
>have it work, but I haven't taken the time to do the tests, since I
>still have a decent bucketful of the original. I fire this to cone
>5, not 6, because it's apt to get blisters/small craters if fired too
>hot.
>
>IMCR 6040 (Burgundy Satin)
>
>==============================
> EPK KAOLIN.......... 4.25
> KT 1-4 BALL CLAY.... 5.90
> SILICA.............. 31.60
>GERSTLEY BORATE .. 16.00
> G 200 FELDSPAR...... 4.50
> CUSTER FELDSPAR..... 2.00
> F-4 FELDSPAR........ 11.50
> TALC................ 9.00
> DOLOMITE............ 7.75
>WHITING............. 0.90
> BONE ASH............ 6.60
>SPANISH RED IRON OX. 13.00
> ========
> 113.00
>
> CaO 0.50* 10.51%
> MgO 0.38* 5.76%
> K2O 0.04* 1.51%
> Na2O 0.08* 1.88%
> TiO2 0.00 0.12%
> Al2O3 0.21 7.89%
> B2O3 0.21 5.51%
> P2O5 0.06 3.37%
> SiO2 2.79 63.12%
> Fe2O3 0.01 0.33%
>
> Si:Al 13.57
> SiB:Al 14.60
> Expan 5.87
>
>
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
Chris Schafale on wed 1 dec 99
Hi John,
Thanks for your revisions. I'll look forward to testing them/hearing
about others' tests. I found iron reds so touchy (so hard to get red
instead of brown), that I didn't dare mess with this one so much. It
will be really interesting if one or both of these work. By the way,
I have to say that this glaze, as I originally reported it, has much
the best working slurry properties of any glaze I have -- stays
suspended fine, goes on smooth, very forgiving of drips/thick/thin
spots. Wish all glazes were like this one.
Thanks again.
Chris
> ----------------------------Original message----------------------------
> Hi Sue and Chris,
>
> Here are a couple of revisions to the glaze Chris posted. Both have fewer
> ingredients. The second one uses frits instead of feldspar and gerstley to
> get more clay into the recipe providing a better working slurry. I used
> OM4 as the ball clay in my calculations. I increased the expansion just a
> bit in both revisions. (This glaze base without the iron has very low
> expasion, around 60.0 x 10e-7 per degree C.) If you decide to test either
> of these revisions, let us know how they workout.
> (All these glazes are cone 5-6 oxidation.)
>
> John Post
>
> +++++++++++++++++++++++
> +++ IMCR 6040-1 +++
> +++++++++++++++++++++++
>
> Date: 11/24/99
>
> Gerstley borate 16.6
> Bone ash 6.8
> Custer feldspar 19.9
> Wollastonite 7.1
> Talc 14.6
> EPK 9
> Flint 26
> --------
> 100
>
> Red iron oxide 13
>
> ===========================
> Chemical Analysis
> ===========================
>
> Na2O 0.06 Al2O3 0.21 SiO2 2.82
> K2O 0.06 B2O3 0.16 P2O5 0.06
> MgO 0.38 Fe2O3 0.24
> CaO 0.50
>
> Alumina:Silica ratio is 1.00 : 13.47
> Neutral:Acid ratio is 1.00 : 8.38
> Alkali:Neutral:Acid ratio is 1.00 : 0.37 : 3.11
>
> Expansion coefficient: 70.0 x 10e-7 per degree C
> Oxides causing abnormal expansion effects: B2O3
>
>
> +++++++++++++++++++++++
> +++ IMCR 6040-2 +++
> +++++++++++++++++++++++
>
> Date: 11/24/99
>
> Frit 3110 15.1
> Frit 3134 15
> Bone ash 6.6
> Wollastonite 4.7
> Talc 16
> EPK 17.9
> Flint 24.7
> --------
> 100
>
> Red iron oxide 13
>
> ===========================
> Chemical Analysis
> ===========================
>
> Na2O 0.17 Al2O3 0.21 SiO2 2.87
> K2O 0.01 B2O3 0.15 P2O5 0.05
> MgO 0.35 Fe2O3 0.22
> CaO 0.47
>
> Alumina:Silica ratio is 1.00 : 13.87
> Neutral:Acid ratio is 1.00 : 8.78
> Alkali:Neutral:Acid ratio is 1.00 : 0.36 : 3.14
>
> Expansion coefficient: 72.3 x 10e-7 per degree C
> Oxides causing abnormal expansion effects: B2O3
>
>
> The original recipe...
> +++++++++++++++++++++
> +++ IMCR 6040 +++
> +++++++++++++++++++++
>
> Date: 11/24/99
>
> EPK 4.25
> Kentucky OM #4 5.9
> Flint 31.6
> Gerstley borate 16
> G-200 4.5
> Custer feldspar 2
> Kona F-4 11.5
> Talc 9
> Dolomite 7.75
> Whiting 0.9
> Bone ash 6.6
> --------
> 100
>
> Red iron oxide 13
>
> ===========================
> Chemical Analysis
> ===========================
>
> Na2O 0.08 Al2O3 0.21 SiO2 2.83
> K2O 0.04 B2O3 0.16 P2O5 0.06
> MgO 0.38 TiO2 0.00
> CaO 0.50 Fe2O3 0.25
>
> Alumina:Silica ratio is 1.00 : 13.78
> Neutral:Acid ratio is 1.00 : 8.54
> Alkali:Neutral:Acid ratio is 1.00 : 0.37 : 3.14
>
> Expansion coefficient: 69.8 x 10e-7 per degree C
> Oxides causing abnormal expansion effects: B2O3
>
>
>
>
> John Post
> Sterling Heights, Michigan
>
> rp1mrvl@moa.net
>
>
Light One Candle Pottery
Fuquay-Varina, NC
candle@intrex.net
| |
|
