Ravenscrag base glossy and matte glazes

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Pure Ravenscrag Slip, from Plainsman Clays, is a cone 10R transparent glaze recipe all by itself. With small additions, it can also produce opaque mattes and glossies.


Ravenscrag Cone 10R Transparent Base

Code #

GR10-A

Materials Amt
Ravenscrag Slip 50.000
Ravenscrag Slip 1000F Roast 50.000

Total:100.00

Auto Unity Formula

CaO 0.68
MgO 0.16
K2O 0.12
Na2O 0.03
(KNaO) 0.15
TiO2 0.02
Al2O3 0.47
SiO2 3.91
Fe2O3 0.02

Ratios

Si:Al: 8.3:1
R2O:RO: 0.2:0.8

Expansion

6.4 (Molar:6.1)

LOI

5.9

Notes

*At 100% Ravenscrag Slip produces a silky gloss almost transparent glaze at cone 10R. It has a much more natural quality than a transparent made from refined mineral powders.

A glossy white can be produced with an addition of Zircopax (like GR10-CW).

Pictures

Ravenscrag GR10 glaze variations

Left mug inside: G1947U clear
Left & right mugs outside: GR10-CW White
Right mug inside: GR10-A transparent (pure Ravenscrag Slip)
Clay body is H550.

Typecodes

ST-Untitled typecode

Alternate Code Number:MRG10A

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Ravenscrag Cone 10R Transparent Base" id="70517" key="LDZiDhHZ" date="2022-12-10" typecodes="ST" codenum="GR10-A" picturebasename=""> <recipelines> <recipeline material="Ravenscrag Slip" amount="50.000" tolerance=""/> <recipeline material="Ravenscrag Slip 1000F Roast" amount="50.000" tolerance=""/> </recipelines> </recipe> </recipes>

Born: 2006-05-09, Modified: 2022-12-10 18:12:27

Ravenscrag Talc Matte

RavenTalc Matte

Code #

GR10-C

Materials Amt
Ravenscrag Slip 45.000
Ravenscrag Slip 1000F Roast 45.000
Silverline 303 Talc 10.000

Total:100.00

Auto Unity Formula

CaO 0.52
MgO 0.36
K2O 0.09
Na2O 0.02
(KNaO) 0.11
TiO2 0.01
Al2O3 0.36
SiO2 3.27
Fe2O3 0.02

Ratios

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

Expansion

6.1 (Molar:5.7)

LOI

5.8

Notes

*A stunning matte translucent base glaze that is achieved by a simple 10% addition of talc (it supplies the MgO to create the "dolomite matte" effect).

A mix of 1000 powder, 1000 water = ~1.42 specific gravity, producing a good slurry for use as a dipping glaze in our studio.

Pictures

Cone 10R with GR10-C glaze inside and outside

The body is H550
The black engobe is G3954N
The mug is completed covered with the GR10-C glaze.

G1947U white vs GR10-C talc matte at cone 10R

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Ravenscrag Talc Matte" keywords="RavenTalc Matte" id="73681" key="RvLFcFuS" date="2024-04-11" codenum="GR10-C" picturebasename=""> <recipelines> <recipeline material="Ravenscrag Slip" amount="45.000" tolerance=""/> <recipeline material="Ravenscrag Slip 1000F Roast" amount="45.000" tolerance=""/> <recipeline material="Silverline 303 Talc" amount="10.000" tolerance=""/> </recipelines> </recipe> </recipes>

Born: 2004-09-15, Modified: 2024-04-11 17:06:44

Ravenscrag Cone 10R Talc Matte White

RavenTalc White Matte

Code #

GR10-CW

Materials Amt
Ravenscrag Slip 35.000
Ravenscrag Slip 1000F Roast 52.000
Silverline 303 Talc 10.000
Additions
Zircopax 6.000

Total:103.00

Notes

*The Zircopax addition increases the gloss and the opacity of the GR10-C base recipe.

In our lab 1000 powder and 920 water produce a good consistency for use as a dipping glaze.

The 52:35 ratio is being used (rather than the normal 45:45) to minimize cracking during drying and compensate for the zero LOI of the roast material.

Pictures

Ravenscrag GR10 glaze variations

Left mug inside: G1947U clear
Left & right mugs outside: GR10-CW White
Right mug inside: GR10-A transparent (pure Ravenscrag Slip)
Clay body is H550.

G3952 Ravenscrag Talc Matte White on H440

GR10-CW white on outside of H550 mug

G1947U clear on the inside.

GR10-CW on H440 tests (dark and light)

Alternate Code Number:G3952

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Ravenscrag Cone 10R Talc Matte White" keywords="RavenTalc White Matte" id="224882" key="4H5CRoZg" date="2023-07-28" codenum="GR10-CW" 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="Zircopax" amount="6.000" added="true"/> </recipelines> </recipe> </recipes>

Born: 2004-09-15, Modified: 2023-07-28 11:06:10