Cone 10 Ravenscrag Slip Glazes

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Ravenscrag by itself fires to an excellent cone 10 glaze, thus it makes a great base.

Test for leaching by placing your glaze sample in vinegar over night (or for a few days) to see if the color or surface has changed at all (if it leaches it may not be food safe depending on what materials are in the recipe). Also test for crazing by heating glaze samples to around 350F and then submerging them into room temperature water (do this 2 to 3 times).

Courtesy of Digitalfire Reference Library

Alberta Slip:Ravenscrag Cone 10R Celadon

Code: GR10-E

Ravenscrag:Alberta Slip celadon (45% of each with 10% frit 3134). The frit needs to be cut to about 5%.

 
Recipe
Alberta Slip47.50
Ravenscrag Slip47.50
Frit 31345.00
100.00

Adjust the proportions of Alberta Slip to Ravenscrag to fine tune the color (more Ravenscrag for lighter color). 10% iron runs too much, try 5%.

Ravenscrag Cone 10R Dolomite base

Code: GR10-F

 Plainsman Cone 10R Ravenscrag Slip Glaze

Ravenscrag plus dolomite on H440


Ravenscrag plus dolomite on H550


Ravenscrag plus dolomite on H570

 
Recipe
Ravenscrag Slip90.00
Dolomite10.00
Red Iron Oxide1.50
101.50

The sample bowls shown here are the base three-part glaze on the left and on the right 1.5% more iron oxide, 4% rutile and 2% cobalt carbonate have been added.

Ravenscrag Cone 10R Silky Magnesia Matte

Code: GR10-J

G2895 Ravenscrag Magnesia matte (left) and G2571A Magnesia matte (right). Surfaces are identical. Ironware body, cone 10 reduction.


G2895 Ravenscrag Magnesia matte (right) and G2571A Magnesia matte (left). Surfaces are identical but this is slightly darker in color than G2571A. White stoneware at cone 10R.

 
Recipe
Ravenscrag Slip51.60
Dolomite12.10
Talc2.60
Boraq 54.00
Calcined Kaolin13.50
Custer Feldspar16.20
100.00

This has the same chemistry as the long-used G2571A, however its sources the oxides from a completely different recipe based on Ravenscrag Slip. The pleasant silky surface is identical (although slighly darker in color) and like the original it does not craze on stonewares, it does not cutlery mark or stain. In addition it has the excellent application and suspending properties of Ravenscrag Slip glazes.

Ravenscrag Cone 10R Silky White

Code: GR10-G

Ravenscrag Cone 10R White glaze GR10-G


GR10-G Ravenscrag white glaze at cone 10 oxidation


GR10-H Silky white Ravenscrag white cone 10R (contains 85 Ravenscrag, 10 talc, 4 Tin).


GR10-I Silky matte cone 10R (Ravenscrag 100, Talc 4, Tin Oxide 4).

 
Recipe
Ravenscrag Slip100.00
Talc10.00
Tin Oxide4.00
114.00

Ravenscrag Cone 10R Talc Matte

Code: GR10-C

GR10-C Ravenscrag glaze on iron stoneware


GR10-C Ravenscrag glaze on grey stoneware.

 
Recipe
Ravenscrag Slip90.00
Talc10.00
100.00

Ravenscrag Cone 10R Whiting Base

Code: GR10-B

 Cone 10 Reduction Glaze

Ravenscrag and plus whiting on H550


Ravenscrag and plus whiting on H570


Ravenscrag and plus whiting on H440

 
Recipe
Ravenscrag Slip90.00
Whiting10.00
100.00

10% whiting addition is shown on right side of bowls.

Ravenscrag Slip by itself as a glaze

Code: GR10-A

 Ravenscrag all by itself makes a great cone 10 glaze

A buff stoneware vase with 100%
Ravenscrag Slip glaze on Laguna B-Mix clay

 
Recipe
Ravenscrag Slip100.00
100.00

Ravenscrag Slip is a revolutionary glaze material for stoneware. At cone 10R it can be used as 100% of the glaze mix and it produces a beautiful silky surface. Many classic cone 10 recipes can be made by simple additions. For example:

Celadon: Add 3-5% iron oxide
Brown crystal: Add 6-8% iron oxide
Tenmoku: Add 9-11% iron oxide
Kaki: Add 11-13% iron oxide
White: Add 4-10% Zircopax

Other colorants: the possibilities are endless.

Ravenscrag has great slurry and application properties, and you can put multiple layers of glaze on the ware.

The bowl samples show here have 100% Ravenscrag on the left, 10% whiting is added on the right.