Judy Musicant on mon 20 mar 00
Thanks to David Hendley and Ron Roy for their discussions about
substitutions for barium. I wonder if any have specific suggestions for
amounts of strontium and whiting to substitute in the following recipe for
Amy's Blue Violet which was in CM a number of years ago (CONE 6, ELECTRIC):
Barium........20.62
Whiting.......5.15
Dolomite....12.37
Ger. Bor....2.06
Neph. Sy...31.96
EPK..........8.25
Flint..........19.59
Tin Ox......3.09
Zinc Ox...3.08
Cob. Carb..26 (that's .26)
Copper Carb..1.03
Mason St. 6005...8.25
This glaze is very matte, doesn't run, works very well with many other
glazes. When the right thickness and temp., it is a sort of mottled blue
and voilet. When applied thinner, and or hotter, tends to be mostly a nice
medium blue. When thicker and/or cooler, it can be completely violet. Very
interesting, and a very big seller. Because of the barium, I never use it
on food surfaces.
Thanks for any input.
Judy
Sharon31 on tue 21 mar 00
As far as I know, you use 2/3 Strontium carbonate instead of the barium,
about the whiting, I suggest to you to try a small batch and Change it 1 for
1. The barium helps to the copper to create nice color.
I had a very nice clear glaze, I posted it last year,it advantage was as a
"carrier" of other colored glazes, they look much more above it than on the
bare clay.
I don't have strontium, so I changed the barium for whiting and it works
good!
Koren 27
========
QUARTZ.............. 26.00 26.53%
FELDSPAR soda....... 35.00 35.71%
WHITING............. 13.00 13.27%
BARIUM CARBONATE.... 9.00 9.18%
ENGLISH KAOLIN(Puraf 5.00 5.10%
ZINC OXIDE.......... 10.00 10.20%
========
98.00
BaO 0.12* 7.80%
CaO 0.38* 8.80%
MgO 0.00* 0.02%
K2O 0.05* 2.04%
Na2O 0.11* 2.69%
ZnO 0.33* 11.16%
TiO2 0.00 0.01%
Al2O3 0.23 9.64%
SiO2 2.34 57.79%
Fe2O3 0.00 0.06%
Si:Al 10.17
SiB:Al 10.17
Expan 7.71
The new version:
Koren clear^6(WHITING)
======================
FELDSPAR soda....... 35.00 35.71%
QUARTZ.............. 26.00 26.53%
WHITING............. 22.00 22.45%
ENGLISH KAOLIN(Puraf 5.00 5.10%
ZINC OXIDE.......... 10.00 10.20%
========
98.00
CaO 0.56* 14.75%
MgO 0.00* 0.02%
K2O 0.05* 2.09%
Na2O 0.09* 2.75%
ZnO 0.30* 11.41%
TiO2 0.00 0.01%
Al2O3 0.21 9.86%
SiO2 2.09 59.07%
Fe2O3 0.00 0.06%
Cost/kg 4.14
Si:Al 10.17
SiB:Al 10.17
Expan 7.71
And now I can use it every where.
A nice glaze, I found in P.M.I, with a small changing, looks great above
both glazes
Speckles----- Gray
==================
GERSTLEY BORATE..... 20.00 18.78%
NEPHELINE SYENITE... 20.00 18.78%
FRIT 3110........... 15.00 14.08%
BALL CLAY........... 15.00 14.08%
QUARTZ.............. 30.00 28.17%
IRON OXIDE RED...... 1.50 1.41%
TITANIUM DIOXIDE.... 5.00 4.69%
========
106.50
CaO 0.42* 5.39%
MgO 0.12* 1.08%
K2O 0.06* 1.37%
Na2O 0.40* 5.58%
TiO2 0.28 5.07%
Al2O3 0.46 10.61%
B2O3 0.40 6.28%
SiO2 4.60 62.89%
Fe2O3 0.05 1.72%
Si:Al 10.06
SiB:Al 10.93
Expan 7.45
Notes:
1) BLUE GRAY:1% COBALT OXIDE
2)BEIGE: 3RUTILE
3)GREEN1 COPPER CARBONAT
1 CHROM OXIDE
4)DARK BLUE: 3COBALT OXIDE
MUST BE ABOVE kOREN 27!OR KOREN GIR
Keep creating
(Glaze is my addiction-but I do not drink it! )
Ababi
sharon@shoval.org.il
http://www.israelceramics.org/main.asp?what=gallery
http://clay.justnet.com/cgallery/asharon.htm
----- Original Message -----
From: Judy Musicant
To:
Sent: Monday, March 20, 2000 04:18
Subject: substitutes for barium
> ----------------------------Original message----------------------------
> Thanks to David Hendley and Ron Roy for their discussions about
> substitutions for barium. I wonder if any have specific suggestions for
> amounts of strontium and whiting to substitute in the following recipe for
> Amy's Blue Violet which was in CM a number of years ago (CONE 6,
ELECTRIC):
>
> Barium........20.62
> Whiting.......5.15
> Dolomite....12.37
> Ger. Bor....2.06
> Neph. Sy...31.96
> EPK..........8.25
> Flint..........19.59
>
> Tin Ox......3.09
> Zinc Ox...3.08
> Cob. Carb..26 (that's .26)
> Copper Carb..1.03
> Mason St. 6005...8.25
>
> This glaze is very matte, doesn't run, works very well with many other
> glazes. When the right thickness and temp., it is a sort of mottled blue
> and voilet. When applied thinner, and or hotter, tends to be mostly a
nice
> medium blue. When thicker and/or cooler, it can be completely violet.
Very
> interesting, and a very big seller. Because of the barium, I never use it
> on food surfaces.
>
> Thanks for any input.
>
> Judy
David Hendley on wed 29 mar 00
This sounds like a "copper-barium matt" glaze.
I use a cone 10 version (non-functional surfaces only).
It's hard to get these glazes to work without the
barium, but I hope you will give it a try.
The starting place for substituting for barium carbonate
is 2/3 strontium carbonate and 1/3 whiting.
--
David Hendley
Maydelle, Texas
hendley@tyler.net
http://www.farmpots.com/
----- Original Message -----
From: Judy Musicant
To:
Sent: Monday, March 20, 2000 8:18 AM
Subject: substitutes for barium
| ----------------------------Original message----------------------------
| Thanks to David Hendley and Ron Roy for their discussions about
| substitutions for barium. I wonder if any have specific suggestions for
| amounts of strontium and whiting to substitute in the following recipe for
| Amy's Blue Violet which was in CM a number of years ago (CONE 6,
ELECTRIC):
|
| Barium........20.62
| Whiting.......5.15
| Dolomite....12.37
| Ger. Bor....2.06
| Neph. Sy...31.96
| EPK..........8.25
| Flint..........19.59
|
| Tin Ox......3.09
| Zinc Ox...3.08
| Cob. Carb..26 (that's .26)
| Copper Carb..1.03
| Mason St. 6005...8.25
|
| This glaze is very matte, doesn't run, works very well with many other
| glazes. When the right thickness and temp., it is a sort of mottled blue
| and voilet. When applied thinner, and or hotter, tends to be mostly a
nice
| medium blue. When thicker and/or cooler, it can be completely violet.
Very
| interesting, and a very big seller. Because of the barium, I never use it
| on food surfaces.
|
| Thanks for any input.
|
| Judy
|
| |
|
