Cone 10R Light Blue silky matte glaze variations

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Project Name

Project Codenumber

UnAssigned

Cone 10R Robin's Egg Blue

Avocado

Code #

G1847

Materials Amt
EPK 12.000
Zinc Oxide 5.000
Gerstley Borate 2.000
Wollastonite 15.000
Whiting 5.000
Cornwall Stone 13.000
Custer Feldspar 40.500
Silica 5.000
Additions
Ceramic Rutile 5.000
Cobalt Carbonate 0.500
Illmenite 0.250

Total:103.25

Auto Unity Formula

CaO 0.55
K2O 0.17
Na2O 0.08
(KNaO) 0.25
ZnO 0.18
TiO2 0.14
B2O3 0.02
Al2O3 0.38
SiO2 2.65
CoO 0.01

Ratios

Si:Al: 7.0:1
SiB:Al: 7.1:1
R2O:RO: 0.3:0.7

Expansion

8.2 (Molar:7.7)

LOI

5.0

Cost

0.06 per kg

Notes

*This recipe was our favourite for many years, we accepted it as "a package" rather than as a base with a rutile and cobalt addition.

It produces light blue on porcelain and progressively darker coloration as the body iron content increases.

When we were developing the G2571A dolomite matte base, and realizing the silky matting effect of high MgO levels in the calculated formula, it became evident that this glaze is not a dolomite matte! It is a calcium matte. And it became evident that this has a high calculated thermal expansion (from all the feldspar and Cornwall Stone, making it a candidate for crazing).

Thus we only use this on high quartz bodies where there is no danger of crazing.

Pictures

Cone 10R G1847 Robins Egg Blue on H550

Typecodes

RCP-Undefined

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Cone 10R Robin&amp;#039;s Egg Blue" keywords="Avocado" id="63618" key="gHqd2Epy" date="2022-02-26" typecodes="RCP" codenum="G1847" picturebasename=""> <recipelines> <recipeline material="EPK" amount="12.000" tolerance=""/> <recipeline material="Zinc Oxide" amount="5.000" tolerance=""/> <recipeline material="Gerstley Borate" amount="2.000" tolerance=""/> <recipeline material="Wollastonite" amount="15.000" tolerance=""/> <recipeline material="Whiting" amount="5.000" tolerance=""/> <recipeline material="Cornwall Stone" amount="13.000" tolerance=""/> <recipeline material="Custer Feldspar" amount="40.500" tolerance=""/> <recipeline material="Silica" amount="5.000" tolerance=""/> <recipeline material="Ceramic Rutile" amount="5.000" added="true"/> <recipeline material="Cobalt Carbonate" amount="0.500" added="true"/> <recipeline material="Illmenite" amount="0.250" added="true"/> </recipelines> </recipe> </recipes>

Born: 1980-01-01, Modified: 2022-02-26 18:25:50

Cone 10R Silky Matte Blue

Code #

G2571C

Materials Amt
Wollastonite 21.000
Custer Feldspar 32.000
EP Kaolin 20.000
Calcined Kaolin 9.000
Talc 14.000
Ferro Frit 3249 4.000
Additions
Titanium Dioxide 4.000
Cobalt Oxide 0.500

Total:104.50

Auto Unity Formula + Analysis

CaO 0.51 9.97%
MgO 0.34 4.76%
K2O 0.09 3.13%
Na2O 0.04 0.93%
(KNaO) 0.14
TiO2 0.14 3.90%
P2O5 0.00 0.05%
B2O3 0.05 1.11%
Al2O3 0.47 16.83%
SiO2 2.61 54.93%
CoO 0.02 0.45%
Fe2O3 0.00 0.18%

Ratios

Si:Al: 5.5:1
SiB:Al: 5.6:1
R2O:RO: 0.1:0.9

Expansion

6.9 (Molar:6.4)

LOI

3.8

Notes

*G2571A has been our go-to dolomite matte base for many years. It has very low thermal expansion, by virtue of low levels of KNaO, and fits bodies very well. And it thrives on colorant and variegator additions. So it seemed a natural to make our rutile blue using this.

This adds the titanium and cobalt to the new fritted base version of G2571A: G2571B. Titanium is being used to get better blue, rutile supplies TiO2 like titanium, but also brings along iron that muddies blue coloration.

Fabulous results. The variegation is excellent.

More cobalt would be better on white stonewares, perhaps 0.75%.

Pictures

G2571C on a buff stoneware at cone 10R

G2571C blue crystal matte on H443, H550 Cone 10R

G2571C blue crystal matte on H570, Polar Ice cone 10R

Cone 10R G2571C Blue rutile dolomite matte

Typecodes

ST-Untitled typecode

Alternate Code Number:GS10-G

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Cone 10R Silky Matte Blue" id="185875" key="NxakgEDs" date="2022-02-26" typecodes="ST" codenum="G2571C" picturebasename=""> <recipelines> <recipeline material="Wollastonite" amount="21.000" tolerance=""/> <recipeline material="Custer Feldspar" amount="32.000" tolerance=""/> <recipeline material="EP Kaolin" amount="20.000" tolerance=""/> <recipeline material="Calcined Kaolin" amount="9.000" tolerance=""/> <recipeline material="Talc" amount="14.000" tolerance=""/> <recipeline material="Ferro Frit 3249" amount="4.000" tolerance=""/> <recipeline material="Titanium Dioxide" amount="4.000" added="true"/> <recipeline material="Cobalt Oxide" amount="0.500" added="true"/> </recipelines> </recipe> </recipes>

Born: 2006-03-16, Modified: 2022-02-26 18:38:54

Ravenscrag Cone 10R Matte Blue

Code #

G3909

Materials Amt
Ravenscrag Slip 35.000 36.08%
Ravenscrag Slip 1000F Roast 52.000 53.61%
Silverline 303 Talc 10.000 10.31%
Additions
*Mason 6300 Stain 0.500 0.52%

Total:97.50

Auto Unity Formula

CaO 0.52
MgO 0.36
K2O 0.09
Na2O 0.02
(KNaO) 0.11
TiO2 0.01
Al2O3 0.35
SiO2 3.26
Fe2O3 0.02

Ratios

Si:Al: 9.2:1
R2O:RO: 0.1:0.9

Expansion

6.1 (Molar:5.7)

LOI

5.3

Notes

*This is a variation on GR10-C, our Ravenscrag Slip silky-matte base glaze.

This relies on the MgO alone to create variegation. However, some titanium could certainly be added (titanium would be better than rutile here also, to minimize iron content for better blue, the Ravenscrag already contains some iron but not enough to be an issue).

Pictures

G3909 matte blue on H443, H550 Cone 10R

G3909 Ravenscrag Cone 10R Matte Blue on porcelain

Typecodes

ST-Untitled typecode

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Ravenscrag Cone 10R Matte Blue" id="185998" key="BTpCLT5a" date="2022-09-28" typecodes="ST" codenum="G3909" picturebasename=""> <recipelines> <recipeline material="Ravenscrag Slip" amount="35.000" tolerance=""/> <recipeline material="Ravenscrag Slip 1000F Roast" amount="52.000" tolerance=""/> <recipeline material="Silverline 303 Talc" amount="10.000" tolerance=""/> <recipeline material="Mason 6300 Stain" amount="0.500" added="true"/> </recipelines> </recipe> </recipes>

Born: 1980-01-01, Modified: 2022-09-28 12:38:14