John Weber on fri 13 sep 02
Ron Roy has volunteered to help me test some copper red glazes or other
glazes that would be fired with a Copper Red firing schedule. I would
appreciate anyone with a glaze that contains a significant amount of zinc
that fires to Cone 10 in reduction to give me the recipe and we will try to
add it to our testing procedure. I will probably cap out at about 8 to 10
glazes so I won't necessarily be able to test every glaze. In advance
thanks for your help. Please send the glazes to me off list: (Thanks
John Weber)
JODO Pottery
Manakin-Sabot, VA
E-Mail: jodopottery@attbi.com
WEB PAGE: http://jodo96.home.attbi.com
June Perry on sat 14 sep 02
Here are a few from my glaze database.
Regards,
June Perry
#714 OFF WHITE MATT 10-11 REDUCTION
NEPHELINE SYENITE 36
KINGSLEY KAOLIN 22
DOLOMITE 14
SILICA 14
WHITING 8
ZINC OXIDE 6
#989 OPAQUE FELDSPATHIC BUTTERY GLAZE C8- 10 REDUCTION
POTASH FELDSPAR 47.4
FLINT 29.1
CHINA CLAY 1.7
DOLOMITE 6.2
ZINC OXIDE 5.8
WHITING 10.1
TOTL 100.3
BLUE - COBALT CARB .75%,CHROME .25%
GOOD FOR ZINC COLORS, BLUES,GREENS
#720 BLUE GREY DRY MATT C10REDUCTION DRY BARIUM MATT
POTASH FELDSPAR 42.7
BARIUM CARBONATE 17.3
WHITING 15.4
PLASTIC VITROX 8.2
VANADIUM PENTOXIIDE 8.2
ZINC OXIDE 6.4
RUTILE 1.8
#831 KARRASH BLUE FROM DORA DE LARIOS C10 REDUCTION
CUSTER FELDSPAR 46.25
WHITING 9.96
ZINC OXIDE 8.98
BARIUM CARBONATE 23.60
KENTUCKY OM#4 BALL CLAY 11.21
BLUE - COBALT OXIDE 1%
BROWN - 1-2 % RED IRON OXIDE
TURQUOISE -COBALT CARB 1/2.CHROME 1%
GREEN-RUTILE 2%,COPPER OXIDE 2
BLUE -COBALT CARB 1,COPPER1,RUTILE2
# 1252 LIGHT JADE GREEN CELADON 9 - 10 REDUCTION
NEPHELINE SYENITE 77.4
WHITING 40.0
ZINC OXIDE 16.2
BARIUM CARBONATE 19.7
CHINA CLAY 51.6
FLINT 66.0
TOTAL: 270.9
ADD: RED CLAY 10%, OR RED IRON OXIDE 2%
#1162 MATILDA COPPER RED 10 REDUCTION
KINGMAN FELDSPAR 144
EDGAR PLASTIC KAOLIN 5
SILICA 90
WHITING 9
COLEMANITE 30
DOLOMITE 30
ZINC OXIDE 6
BARIUM CARBONATE 15
TIN OXIDE 9
COPPER OXIDE 1.69
TOTAL 339.69
#1113 U.C.S.B. SWEDISH YELLOW 10 REDUCTION BARIUM MATT
CUSTER FELDSPAR 1529.78
WHITING 260.68
ZINC OXIDE 236.18
BARIUM CARBONATE 618.38
KENTUCKY OM#4 BALL CLAY 294.98
RUTILE 58.80
TOTAL 2998.80
ADD: RED IRON OXIDE 4 %
#1161 MUSTARD YELLOW 10 REDUCTION
KINGMAN FELDSPAR 48.98
EDGAR PLASTIC KAOLIN 14.62
WHITING 17.84
ZINC OXIDE 5.27
IRON OXIDE 4.43
RUTILE 8.86
TOTAL 100
BETTER OUTSIDE GLAZE NICE ON TEXTURE
#400 G MATT WHITE 10 REDUCTION/ OXIDATION - GOOD ON PORCELAIN WHITE
- WITH MOTTLED EFFECT -
POTASH FELDSPAR 50.05
WHITING 8.87
ZINC OXIDE 8.04
BARIUM CARBONATE 21.04
BALL CLAY 10
RUTILE 2
GREEN-COPPER CARB 1.3 %
TURQUOISE -COPPER CARB .75%)
BROWN - RED IRON OXIDE 5%
TAN - RED IRON OXIDE 2%
OLIVE- CHROME OX 2.3), BLACK.NICKEL OX 1.5%
COBALT BLUE 1.3%
GREEN MOTTLED BROWN 0.26%, RED IRON OXIDE 2.5%
#710 OTIS BRIGHT BARIUM MATT OFF WHITE C10-11 REDUCTION
KINGMAN FELDSPAR 51.25
BARIUM CARBONATE 17.91
ZINC OXIDE 15.42
CHINA CLAY 10.41
WHITING 6.01
WHITE - TIN OXIDE 5%
BLUE-COBALT CARB 2, REDIRON2,RUTILE 3
#1033 CARLTON BALL G BARIUM MATT #3 C10 REDUCTION
BARIUM CARBONATE 19.6
WHITING 8.3
ZINC OXIDE 7.5
POTASH FELDSPAR 53.5
BALL CLAY 9.3
RUTILE 1.8
#107 GOOD TRANSLUCENT BRIGHT SMOOTH C10
KAOLIN 6
FLINT 41
NEPHELINE SYENITE 26
BARIUM CARBONATE 11
ZINC OXIDE 4
DOLOMITE 5
WHITING 7
# 175 C10 REDUCTION ORANGE
POTASH FELDSPAR 48.95
WHITING 17.83
EDGAR PLASTIC KAOLIN 14.61
RUTILE 8.88
ZINC OXIDE 5.31
RED IRON OXIDE 4.42
TOTAL 100
494 TOM COLEMANS CANDY RED c10-11 REDUCTION
NEPHELINE SYENITE 11.14
POTASH FELDSPAR 20.00
SILICA 29.36
COLEMANITE 14.10
ZINC OXIDE 8.27
BARIUM CARBONATE 6.27
COPPER CARBONATE 2
TIN OXIDE 1.5
TOTAL 93.07
CAN ADD 1/4% FINE SILICON CARBIDE IF BRIGHT RED IS HARD TO OBTAIN.
#558 TRANSLUCENT SEMI GLOSS 10 REDUCTION
KONA F4# SODASPAR 30
SILICA 25
ZINC OXIDE 16.5
KAOLIN (EPK) 11.5
WHITING 9.7
SPODUMENE 5.8
MAGNESIUM CARBONATE 1.5
CMC 1 TSP
#848 DORA DE LARIOS WHITE HOUSE SPECIAL C10 REDUCTION WHITE SHINY
KINGMAN FELDSPAR 58.07
NEPHELINE SYENITE 16.13
ZINC OXIDE 8.06
EDGAR PLASTIC KAOLIN 8.06
WHITING 9.68
ADD:BORIC ACID 1.1%
#994 VERY DRY STONY MATT 9 -10 REDUCTION
NEPHELINE SYENITE 33.6
DOLOMITE 13.4
WHITING 7.3
ZINC OXIDE 5.9
CHINA CLAY 22.5
FLINT 17.4
TOTAL 100.1
COBALT CARB 1/2%, RED IRON OXIDE 1%
RED IRON 2%,RUTILE 1.5%
#1031 HAMADA LIKE KHAKI C10 REDUCTION SATURATED IRON
NEPHELINE SYENITE 39
GERSTLEY BORATE 20
ZINC OXIDE 9
BARIUM CARBONATE 10
KAOLIN 21
FLINT 23
RED IRON OXIDE 5
TOTAL 127
David Hendley on mon 16 sep 02
As I mentioned earlier, I did the "zinc-no zinc" tests on several
cone 10 reduction glazes in 1999.
Here are some of the glazes I tested:
Porcelain White
aka Martha's White
soda feldspar 40
flint 30
whiting 30
kaolin 15
zinc oxide 10
titanium dioxide 10
Dean's Matt
soda feldspar 3096
flint 336
kaolin 924
whiting 1128
zinc oxide 516
titanium dioxide 180
rutile 120
Apricot
Custer feldspar 46
dolomite 25.5
zinc oxide 4.5
kaolin 7.2
flint 16.8
bentonite 2
manganese dioxide 2
chrome oxide .5
For these 3 glazes, we could see no discernable difference
with and without zinc oxide.
I also tested 2 glazes that people from Clayart sent me.
Unfortunately, I've lost the recipes.
One was called "Soto", and there appeared to be no
difference with and without zinc oxide.
Dave Cuzick's Rutile Blue, however, gave different results,
consistent over 4 sets of test tiles.
Dave had told me that the zinc helped reduce pinholing
in this glaze, and I found that to be true also.
The glaze with the zinc also looked a little darker blue in
color and a little more fluid.
This would be a good glaze to test again, to see if you also
see a difference from including zinc in the recipe.
Dave's address is (or was, a couple of years ago):
cuzickpottery@home.com
I also did many tests over many firings of my copper red
glaze, and concluded that zinc oxide added nothing to the
fired properties of the glaze.
See "Simply Red" in October 1999 Ceramics Monthly.
David Hendley
Maydelle, Texas
hendley@tyler.net
http://www.farmpots.com
----- Original Message -----
> Ron Roy has volunteered to help me test some copper red glazes or other
> glazes that would be fired with a Copper Red firing schedule. I would
> appreciate anyone with a glaze that contains a significant amount of zinc
> that fires to Cone 10 in reduction to give me the recipe and we will try
to
> add it to our testing procedure. I will probably cap out at about 8 to 10
> glazes so I won't necessarily be able to test every glaze. In advance
> thanks for your help. Please send the glazes to me off list: (Thanks
> John Weber)
>
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