Cone 10R Tenmoku Glazes

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Tenmokus should be viewed at a base glaze with iron oxide addition. Adjusting the iron affects the melt fluidity, depth and variegation of color.


Cone 10R Tenmoku Glossy

Code #

G2576B

Materials Amt
Custer Feldspar 27.000
EPK Kaolin 20.500
Flint 26.500
Wollastonite 23.500
Zinc Oxide 2.500
Additions
Iron Oxide Red 11.000

Total:111.00

Auto Unity Formula

CaO 0.75
K2O 0.10
Na2O 0.05
(KNaO) 0.15
ZnO 0.10
Al2O3 0.41
SiO2 3.69
Fe2O3 0.23

Ratios

Si:Al: 9.0:1
R2O:RO: 0.2:0.8

Expansion

7.2 (Molar:6.7)

LOI

4.5

Cost

0.16 per kg

Notes

*This uses the G1947U base transparent recipe and adds 10% iron oxide. We used this for many years. However, the 10% iron makes this very messy to work. The iron also gels the slurry making it difficult to apply evenly and causing problems with cracking during drying.

Pictures

Typecodes

ST-Untitled typecode

Alternate Code Number:GS10-I

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Cone 10R Tenmoku Glossy" id="63988" key="S7GnLgPT" date="2022-02-26" typecodes="ST" codenum="G2576B" picturebasename=""> <recipelines> <recipeline material="Custer Feldspar" amount="27.000" tolerance=""/> <recipeline material="EPK Kaolin" amount="20.500" tolerance=""/> <recipeline material="Flint" amount="26.500" tolerance=""/> <recipeline material="Wollastonite" amount="23.500" tolerance=""/> <recipeline material="Zinc Oxide" amount="2.500" tolerance=""/> <recipeline material="Iron Oxide Red" amount="11.000" added="true"/> </recipelines> </recipe> </recipes>

Born: 1995-04-21, Modified: 2022-02-26 19:56:38

Alberta Slip Tenmoku #1

Code #

G2880

Materials Amt
Alberta Slip 100.000 95.24%
Whiting 5.000 4.76%
Additions
*Iron Oxide Red #120 1.000 0.95%

Total:106.00

Auto Unity Formula

CaO 0.48
MgO 0.30
K2O 0.11
Na2O 0.11
(KNaO) 0.22
TiO2 0.01
Al2O3 0.46
SiO2 2.74
Fe2O3 0.09

Ratios

Si:Al: 6.0:1
R2O:RO: 0.2:0.8

Expansion

7.4 (Molar:6.9)

LOI

10.9

Cost

0.05 per kg

Notes

*Alberta Slip is almost a tenmoku by itself. This small addition of calcium carbonate and iron produce a little more melt fluidity and better crystallization of the iron. Of course, like any tenmoku, thickness must be controlled: Enough to get the visual effect but not so much that it runs.

Alberta Slip, as a base for a tenmoku, it a very good choice because so little added iron is needed.

Pictures

G2880 Alberta Slip Tenmoku Cone 10R glaze cone

G2880 Alberta Slip Tenmoku Cone 10R glaze cones

G2880 Alberta Slip Tenmoku Cone 10R mugs

This compares the tenmoku with 1% iron (right) with our standard tenmoku recipe.

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Alberta Slip Tenmoku #1" id="70798" key="oQBiN2gg" date="2022-02-26" codenum="G2880" picturebasename=""> <recipelines> <recipeline material="Alberta Slip" amount="100.000" tolerance=""/> <recipeline material="Whiting" amount="5.000" tolerance=""/> <recipeline material="Iron Oxide Red #120" amount="1.000" added="true"/> </recipelines> </recipe> </recipes>

Born: 2008-12-03, Modified: 2022-02-26 19:55:22

Alberta Slip Tenmoku #2

Code #

G2880A

Materials Amt
Alberta Slip 100.000 95.24%
Whiting 5.000 4.76%
Additions
*Iron Oxide Red #120 2.000 1.90%

Total:107.00

Auto Unity Formula

CaO 0.48
MgO 0.30
K2O 0.11
Na2O 0.11
(KNaO) 0.22
TiO2 0.01
Al2O3 0.46
SiO2 2.74
Fe2O3 0.09

Ratios

Si:Al: 6.0:1
R2O:RO: 0.2:0.8

Expansion

7.4 (Molar:6.9)

LOI

10.9

Cost

0.05 per kg

Notes

*Same recipe but with a little more iron oxide. Perfecting the amount of iron is just a matter of continuous use and experimentation in your circumstances.

We found that this can crystallize more heavily when applied more thinly on porcelains.

Pictures

G2880A Tenmoku on porcelain, buff stoneware

G2894A on left, G2880A center, GA10

G2894A on left, G2880A center, GA10-A pure Alberta Slip right.

G2880A Tenmoku over L3954N black engobe

Pooled and bubbled on the inside bottom because of very heavy reduction, but outside results of tenmoku are very good.

G2880A tenmoku on porcelain

Glaze application is thinner, reduction heavy.

Alternate Code Number:GA10-B

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Alberta Slip Tenmoku #2" id="66220" key="bWEFa3Pm" date="2022-02-26" codenum="G2880A" picturebasename=""> <recipelines> <recipeline material="Alberta Slip" amount="100.000" tolerance=""/> <recipeline material="Whiting" amount="5.000" tolerance=""/> <recipeline material="Iron Oxide Red #120" amount="2.000" added="true"/> </recipelines> </recipe> </recipes>

Born: 2011-08-02, Modified: 2022-02-26 20:15:07

Ravenscrag Tenmoku #1

Code #

G2894

Materials Amt
Ravenscrag Slip 90.000
Whiting 10.000
Additions
Iron Oxide 10.000

Total:110.00

Auto Unity Formula

CaO 0.78
MgO 0.11
K2O 0.08
Na2O 0.02
(KNaO) 0.11
TiO2 0.01
Al2O3 0.33
SiO2 2.74
Fe2O3 0.19

Ratios

Si:Al: 8.3:1
R2O:RO: 0.1:0.9

Expansion

7.5 (Molar:7.0)

LOI

12.8

Cost

12.41 per kg

Notes

*Ravenscrags slip is a clear glaze by itself, with a little extra help to help (by adding the calcium carbonate) it has better melt fluidity. Like a normal tenmoku, this adds 10% iron.

However it is too melt fluid, the whiting should be reduced to 5 or eliminated.

Pictures

G2894 Ravenscrag Tenmoku on porcelains

G2894 Ravenscrag Tenmoku on dark bodies

Alternate Code Number:GR10-K

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Ravenscrag Tenmoku #1" id="66218" key="ZJBicZJu" date="2022-02-26" codenum="G2894" picturebasename=""> <recipelines> <recipeline material="Ravenscrag Slip" amount="90.000" tolerance=""/> <recipeline material="Whiting" amount="10.000" tolerance=""/> <recipeline material="Iron Oxide" amount="10.000" added="true"/> </recipelines> </recipe> </recipes>

Born: 2011-07-29, Modified: 2022-02-26 20:00:41

Ravenscrag Tenmoku #2

Code #

G2894A

Materials Amt
Ravenscrag Slip 95.000
Whiting 5.000
Additions
Iron Oxide 10.000

Total:110.00

Auto Unity Formula

CaO 0.73
MgO 0.13
K2O 0.10
Na2O 0.03
(KNaO) 0.13
TiO2 0.02
Al2O3 0.39
SiO2 3.25
Fe2O3 0.21

Ratios

Si:Al: 8.3:1
R2O:RO: 0.1:0.9

Expansion

7.3 (Molar:6.6)

LOI

11.1

Cost

12.35 per kg

Notes

*Less calcium carbonate, this had less problems with running than G2894. Later, we went a little further, reducing the calcium carbonate to 3. Getting the right recipe will just be a matter of fine-tuning this amount.

Pictures

G2894A on left, G2880A center, GA10

G2894A on left, G2880A center, GA10-A pure Alberta Slip right.

G2894A Ravenscrag Tenmoku fired mugs

Runs badly on porcelain, a little to fluid on H550.

Alternate Code Number:GR10-K1

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Ravenscrag Tenmoku #2" id="64410" key="po79bp5C" date="2022-02-26" codenum="G2894A" picturebasename=""> <recipelines> <recipeline material="Ravenscrag Slip" amount="95.000" tolerance=""/> <recipeline material="Whiting" amount="5.000" tolerance=""/> <recipeline material="Iron Oxide" amount="10.000" added="true"/> </recipelines> </recipe> </recipes>

Born: 2011-08-02, Modified: 2022-02-26 20:03:56