ARTWORK by James Q. Jacobs

Cone 6 and 7 Glaze Formulas

Here are a few glaze formulas I have modified,
developed, or used at Mesa Community College.
Scroll down or use the links.

Glossy Black
Red Chun
Majolica White
Shino
Noxema Blue
Stony White
Ohata
Temoku

 
If you adjust the formulas, let me know about your changes and results.

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Stony White -- cone 6-7

The first formulation was developed for spraying. When dipped the thicker areas fired rough in texture, with pitting. The second formulation was developed to resolve the texture problem, and has not been vigorously tested. Also, the quantity of red iron oxide in our studio batches was often mixed in the 0.3 to 0.5 percent range, instead of one percent. The pot on the left has a thin spray on the outside and tenmoku on the inside. The body is a studio pug clay with red iron oxide added.

 
First formulation
Second formulation
nepheline syenite
340
26
silica / flint
250
28
whiting
130
17
kaolin
72
8
titanium oxide
60
6
lithium carbonate
36
4
zinc oxide
27
3
bentonite
18
2
tin oxide
18
2
zircopax
18
2
magnesium carbonate
1
1
red iron oxide
1
1
TOP
Bone Ash -- cone 7
G-200 390
Dolomite 300
EPK Kaolin 260
Bone Ash 50
Glaze sprayed over red iron oxide spray on white stoneware. Thick application is white, thinnest application is near the base. Richest brown areas have more iron spray.
I reformulated this glaze for cone 7 firing.

More example pieces on Pottery V page.


This glaze is an attempt to create a high fire glaze that looks like burnished Puebloan earthenware. I do not recommend this formula for food ware.

Pueblo Black -- cone 7
G-200
148
epk kaolin
81
dolomite
83
whiting
12
milled borax
20
cobalt carbonate
25
red iron oxide
20
bentonite
7
nepheline syenite
4
Blue Hawaii -- cone 7

Blue Hawaii on porcelain. This glaze is very stable, and can be applied thick. Will blush lavender with good reduction at cone 7. See also bowl atop this page.
custer feldspar
340
silica
236
whiting
144
talc
32
bone ash
16
epk kaolin
8
gerstley borate
9
bentonite
8
copper carbonate
8
cobalt carbonate
4

Base recipe thanks to Judith Marks
Crater Rim Ceramics, Hawaii.


Majolica White - cone 6-7

The bottle on the right is coated with a thin spray of Majolica. The glaze was wiped off the design portion, to provide contrast, before a thin coat of glaze was added. Applied thick this is an opaque, white glaze. I find it to be particularly suitable for dinnerware, such as the insides of mugs. It also combines well with Noxema.

The clay used for the bottle is a studio pug blend with added iron. Speckling of several iron glazes also overlaid after spraying. To read about how the bas relief design was created go to the Pottery I page.
gerstley borate
300
custer feldspar
214
flint
180
zircopax
128
kaolin
111
dolomite
42
talc
25
TOP

Red Chun -- cone 6

Start your reduction at cone 04 and stay in reduction for the entire firing.

custer feldspar
428
silica
153
whiting
133
frit 3124
122
kaolin
51
zinc oxide
41
talc
31
tin oxide
21
bentonite
10
copper carbonate
10

Noxema Blue - cone 6

This bowl was thrown with Gary's white porcelain. The rim is double glazed. The interior is coated with a thin spray of Noxema Blue. The exterior has a thin spray coat of Stony White.

custer feldspar
483
wollastonite
232
kaolin
111
gerstley borate
101
flint
45
cobalt carbonate
28

Temoku -- cone 6-7

feldspar
432
silica
260
whiting
210
kaolin
100
red iron oxide
200
bentonite
38
Shino -- cone 6
nepheline syenite
545
spodumene
228
ball clay
149
gerstley borate
49
soda ash
29

Orange Carbon Trap Shino -- cone 7
nepheline syenite
160
soda ash
48
OM-4 ball clay
60
custer feldspar
48
epk kaolin
32
spodumene
36
red art clay
12
whiting
4
I have only tested this formula as a light spray, after adjusting the formula from cone 10. It looked good on small test tiles, but be careful.
Glossy Black - cone 6-7
NE arizona pumice
523
wollastonite
131
ball clay
112
gerstley borate
93
flint
75
black stain
66

Ohata - cone 6-7
custer feldspar
473
bone ash
127
flint
109
red iron oxide
91
dolomite
73
kaolin
55
lithium carbonate
36
gerstley borate
36

 


Ohata glaze.

If you test these formulas, I would be interested in your comments.
If you adjust the formulas, please send me any reformulations. Contact.

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