Cone 6 silky oatmeal brown glaze development

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See Also:
Albany Lithium brown glaze development

Our traditional version, a mix of matt G2934 with a little glossy G2926B + the iron and rutile is crawling. This is to develop a Ravenscrag or Alberta Slip version of that.


G2934:G2926B Oatmeal Cone 6

Code #

G3933A

Materials Amt
G2934 Matte Glaze (G2934) 80.000
G2926B Glossy Glaze (G2926B) 20.000
Additions
Red Iron Oxide 1.500
Tin Oxide 5.000
Rutile 1.500

Total:108.00

Auto Unity Formula

CaO 0.53
MgO 0.35
K2O 0.01
Na2O 0.10
(KNaO) 0.11
TiO2 0.06
B2O3 0.10
Al2O3 0.47
SiO2 3.15
Fe2O3 0.04
SnO2 0.11

Ratios

Si:Al: 6.6:1
SiB:Al: 6.9:1
R2O:RO: 0.1:0.9

Expansion

5.9 (Molar:5.9)

LOI

11.9

Cost

9.52 per kg

Notes

*This is no longer recommended this recipe for this color. We have found that it is too prone to crawling and it does not interact enough with darker bodies. The G3933EF is better in every way.

This was an adjustment to our original G3933 for a little more matteness and a little more variegation (this has more iron, more G2934, more rutile.

The original theory behind this recipe was to be able to tune the desired matteness by adjusting a mix our base matte and glossy glazes.

For each 1000 powder we use 930 water (increasing as needed). This produces a creamy slurry that worked very well.

Pictures

G3933 vs G3933A at cone 6

Using the C6DHSC schedule.

G3933A cone 5

Using the C5DHSC firing schedule.

G3933A cone 5 on L4484D black porcelain

Using the C5DHSC firing schedule.

G3933A G2934:G2926B Oatmeal on dark, light body

Standard cone 6 C6DHSC firing schedule on M390, M340.

G3933A On M340, Coffee clay

Drop and soak, 250c/hr down to 1400C.

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="G2934:G2926B Oatmeal Cone 6" id="211015" key="Dk2gDbP7" date="2024-03-13" codenum="G3933A"> <recipelines> <recipeline material="G2934 Matte Glaze" lookup="G2934" amount="80.000" tolerance=""/> <recipeline material="G2926B Glossy Glaze" lookup="G2926B" amount="20.000" tolerance=""/> <recipeline material="Red Iron Oxide" amount="1.500" added="true"/> <recipeline material="Tin Oxide" amount="5.000" added="true"/> <recipeline material="Rutile" amount="1.500" added="true"/> </recipelines> </recipe> </recipes>

Born: 2021-10-27, Modified: 2024-03-13 18:03:42

G3933 Oatmeal Ravenscrag #2

Code #

G3933E

P Materials Amt
Ravenscrag Slip 26.500 26.47%
Ravenscrag Slip 1000F Roast 22.000 21.98%
Calcined Kaolin 14.500 14.49%
Ferro Frit 3249 11.500 11.49%
Dolomite 9.700 9.69%
Ferro Frit 3110 7.100 7.09%
Silica 325 (Silica) 8.800 8.79%
P Additions
* Tin Oxide 5.000 5.00%
* Rutile 1.500 1.50%
* Red Iron Oxide 1.500 1.50%

Total:108.10

Auto Unity Formula

CaO 0.51
MgO 0.35
K2O 0.06
Na2O 0.07
(KNaO) 0.13
B2O3 0.16
Al2O3 0.47
SiO2 3.11

Ratios

Si:Al: 6.6:1
SiB:Al: 6.9:1
R2O:RO: 0.1:0.9

Expansion

6.1 (Molar:5.8)

LOI

7.6

Notes

*This is the product of an effort to achieve the warm and rich color of G3933 without the tendency to crawl. To do that we have used Ravenscrag Slip as the base and sourced MgO from dolomite and Ferro Frit frit 3249 (earlier tests sourcing MgO from talc were unsuccessful, off-gassing from the talc was puffing up the glaze with micro-bubbles).

Requires about 45:55 water:powder to make a good slurry. An advantage of this recipe is the ability to adjust the ratio of raw:calcine Ravenscrag Slip to tune the properties of the slurry (drying hardness, suspension).

Pictures

g3933D vs G3933 vs G3933E

G3933E is glossy but is not puffing up like G3933D does. The original G3933 (centre) is the target surface.

G3933E on porcelain, M340, M390, Coffee Clay

Too glossy (this was not a slow cool firing). However there is no crawling.

G3933 vs G3933E mugs

G3933D has no crawling (while the G3933 has a lot). This was not a slow cool firing.

g3933D vs G3933E mugs

G3933D is puffing up (because of the talc). G3933E has no crawling but is a little too glossy. This was drop-and-hold but not slow cool firing.

G3933 vs G3933E slow and fast cooled

The G3933E has richer color than the original G3933. And it is flexible to be glossy or matte depending on cooling.

G3933E Vs G3933

Slow cool firing. The G3933E is giving a better surface.

Untitled

Typecodes

C6-Cone 6 Glazes

Alternate Code Number:MG6CDM

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="G3933 Oatmeal Ravenscrag #2" id="243984" key="9H1N7stp" date="2024-03-08" typecodes="C6" codenum="G3933E" picturebasename=""> <recipelines> <recipeline material="Ravenscrag Slip" amount="26.500" tolerance=""/> <recipeline material="Ravenscrag Slip 1000F Roast" amount="22.000" tolerance=""/> <recipeline material="Calcined Kaolin" amount="14.500" tolerance=""/> <recipeline material="Ferro Frit 3249" amount="11.500" tolerance=""/> <recipeline material="Dolomite" amount="9.700" tolerance=""/> <recipeline material="Ferro Frit 3110" amount="7.100" tolerance=""/> <recipeline material="Silica 325" lookup="Silica" amount="8.800" tolerance=""/> <recipeline material="Tin Oxide" amount="5.000" added="true"/> <recipeline material="Rutile" amount="1.500" added="true"/> <recipeline material="Red Iron Oxide" amount="1.500" added="true"/> </recipelines> </recipe> </recipes>

Born: 2014-03-21, Modified: 2024-03-08 19:52:15

G3933 Oatmeal Ravenscrag #3

Code #

G3933F

Materials Amt
Ravenscrag Slip 21.500
Ravenscrag Slip 1000F Roast 18.000
Calcined Kaolin 17.500
Ferro Frit 3249 11.000
Dolomite 13.000
Fusion Frit F-75 6.000
Silica 325 (Silica) 13.000
Additions
Tin Oxide 5.000
Rutile 1.500
Red Iron Oxide 1.500

Total:108.00

Auto Unity Formula

CaO 0.51
MgO 0.39
K2O 0.05
Na2O 0.06
(KNaO) 0.10
TiO2 0.06
B2O3 0.15
Al2O3 0.47
SiO2 3.01
Fe2O3 0.04
SnO2 0.11

Ratios

Si:Al: 6.5:1
SiB:Al: 6.8:1
R2O:RO: 0.1:0.9

Expansion

5.9 (Molar:5.7)

LOI

8.7

Cost

0.06 per kg

Notes

*Adds MgO.
1000 powder, 900 water about right.

This is too matte.

Pictures

G3933E (top) vs G3933F (bottom)

Fired cone 6 normal cool.
The G3933E is glossier. The G3933F is too matte (the breaking-where-thin effect is being muted).

G3933F on M390 slow cool firing - Too glossy

G3933E vs F

G2933E and G3933F. The F has a little more MgO (0.39 vs 0.35).

Typecodes

C6-Cone 6 Glazes

Alternate Code Number:MG6CDM

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="G3933 Oatmeal Ravenscrag #3" id="244534" key="b1w5MvDv" date="2024-03-08" typecodes="C6" codenum="G3933F" picturebasename=""> <recipelines> <recipeline material="Ravenscrag Slip" amount="21.500" tolerance=""/> <recipeline material="Ravenscrag Slip 1000F Roast" amount="18.000" tolerance=""/> <recipeline material="Calcined Kaolin" amount="17.500" tolerance=""/> <recipeline material="Ferro Frit 3249" amount="11.000" tolerance=""/> <recipeline material="Dolomite" amount="13.000" tolerance=""/> <recipeline material="Fusion Frit F-75" amount="6.000" tolerance=""/> <recipeline material="Silica 325" lookup="Silica" amount="13.000" tolerance=""/> <recipeline material="Tin Oxide" amount="5.000" added="true"/> <recipeline material="Rutile" amount="1.500" added="true"/> <recipeline material="Red Iron Oxide" amount="1.500" added="true"/> </recipelines> </recipe> </recipes>

Born: 2014-03-21, Modified: 2024-03-08 18:29:32

G3933 Oatmeal Ravenscrag #4

Code #

G3933EF

Materials Amt
Ravenscrag Slip 24.000
Ravenscrag Slip 1000F Roast 20.000
Ferro Frit 3110 6.550
Ferro Frit 3249 11.250
Dolomite 11.350
Calcined Kaolin 16.000
Silica 325 (Silica) 10.900
Additions
Tin Oxide 5.000
Rutile 1.500
Red Iron Oxide 1.500

Total:108.05

Auto Unity Formula

CaO 0.51
MgO 0.37
K2O 0.05
Na2O 0.06
(KNaO) 0.12
TiO2 0.06
B2O3 0.16
Al2O3 0.47
SiO2 3.06
Fe2O3 0.04
SnO2 0.11

Ratios

Si:Al: 6.5:1
SiB:Al: 6.9:1
R2O:RO: 0.1:0.9

Expansion

6.0 (Molar:5.8)

LOI

8.2

Cost

0.06 per kg

Notes

*This is now our recipe of choice. It has a better surface, produces richer brown and variegated tones on dark burning bodies, it has better application properties, it does not crawl and it is much less prone to go on too thin.

The C6DHSC firing schedule produces a nice silky matte. Cooling at 250F/hr produces a glossy. Cooling slower (e.g. 100F/hr) would be more matte.

For 1000 powder we use 800 water (and add more if needed). This give a creamy slurry that needs no additions to be thixotropic.

Pictures

G3933E vs G3933EF Cone 6 slow cool

G3933E vs G3933EF Cone 6 slow cool

The EF is only a tiny bit more matte.

G3933A vs G3933EF

Cone 6 on coffee clay, slow cool @ 250f/hr.

G3933EF at cone 6 on Coffee Clay

These are fired using the C6DHSC schedule. The one on the right was cooled at 150F/hr and is more matte than the one on the left (cooled 250F/hr). The one on the right is also interacting more with the Plainsman Coffee Clay underneath.

Typecodes

C6-Cone 6 Glazes

Alternate Code Number:MG6CDM

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="G3933 Oatmeal Ravenscrag #4" id="245842" key="jzaKQyEE" date="2024-03-13" typecodes="C6" codenum="G3933EF" picturebasename=""> <recipelines> <recipeline material="Ravenscrag Slip" amount="24.000" tolerance=""/> <recipeline material="Ravenscrag Slip 1000F Roast" amount="20.000" tolerance=""/> <recipeline material="Ferro Frit 3110" amount="6.550" tolerance=""/> <recipeline material="Ferro Frit 3249" amount="11.250" tolerance=""/> <recipeline material="Dolomite" amount="11.350" tolerance=""/> <recipeline material="Calcined Kaolin" amount="16.000" tolerance=""/> <recipeline material="Silica 325" lookup="Silica" amount="10.900" tolerance=""/> <recipeline material="Tin Oxide" amount="5.000" added="true"/> <recipeline material="Rutile" amount="1.500" added="true"/> <recipeline material="Red Iron Oxide" amount="1.500" added="true"/> </recipelines> </recipe> </recipes>

Born: 2014-03-21, Modified: 2024-03-13 18:08:15