Kent Potters' Association Glaze Database - Stoneware

Kent Potters' Association Glaze Database

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Stoneware Glazes
(1250°C and above)

Gumbo Base Glaze from Australia
Submitted by Jane Gibson
Recipe
Feldspar20
China Clay40
Magnesium Carbonate20
Flint20
Formula Seger formula from the Glaze Calculator 1 : 0.7 : 3.14
Application and Firing This looks just like cracked mud! Fire cone 9-10. Add oxides for colour: Cobalt 1/4 -1/2 %, Red iron-2-10%, Copper 2-10%
Credits etc  

Matt 'Stony Finish' Glaze
Submitted by Keith Booth
Recipe
Potash Feldspar16
China Clay48
Whiting32
Colemanite4
Formula Seger formula from the Glaze Calculator 1 : 0.6 : 1.6
Application and Firing This glaze gives the white stony finish used on his 'Rock Pots'. Matures at 1280°C.
Credits etc  

Tenmoku
Submitted by Martin Lake
Recipe
Whiting10
Feldspar60
Fremington clay30
+ Iron Oxide7
Formula Seger formula from the Glaze Calculator
Application and Firing Broken shiny tenmoku in reduction at 1280°C
Credits etc Emmanuel Cooper "Cooper's Book of Glaze Recipes"

Orange-brown (Shino red)
Submitted by David C White
Recipe
Nepheline Syenite8
China Clay3
Calcined China Clay2
Cliffe Clay1.5
Calcined Cliffe Clay4
Optional Potash Feldspar1.75
Cliffe clay is similar to a low-firing red earthenware clay which is found in a seam running though the Cliffe Marches on the south bank of the Thames. Try any local red clay. To Calcine the clay, dry it to a powder and sieve through a 60s mesh and include it in a biscuit firing (900°C).
Formula Unknown, as no analysis is available for Cliffe clay
Application and Firing Apply thinly and fire in reduction to 1260-1280°C (Orton cone 9)
Credits etc  

Ash and Clay Glaze
Submitted by David Melville
Recipe
Sheppy clay60
Mixed wood ash20
Crushed Chalk20
Formula Unknown, as no analysis is available for Sheppy clay
Application and Firing No details supplied
Credits etc  

Porcelain Glaze
Submitted by Doris Mitchell
Recipe
Potash Feldspar25
Wollostonite27
China Clay12.5
Ball clay, black6
Flint26
Talc3
+ Bentonite3
Formula Seger formula from the Glaze Calculator 1 : 0.4 : 3.71
Application and Firing I use this glaze a lot but despite the 3% Bentonite it settles badly. On a good day it gives a very smooth finish, from buttery to high gloss.
Credits etc Originally a Nigel Wood recipie which I have modified

Porcelain Glaze
Submitted by Doris Mitchell
Recipe
Potash Feldspar25
Wollostonite27
China Clay12.5
Ball clay, black6
Flint26
Talc3
+ Bentonite3
Formula Seger formula from the Glaze Calculator 1 : 0.4 : 3.71
Application and Firing I use this glaze a lot but despite the 3% Bentonite it settles badly. On a good day it gives a very smooth finish, from buttery to high gloss.
Credits etc Originally a Nigel Wood recipie which I have modified

Raw Glazing Base Glaze
Submitted by Nelly Harris
Recipe
Potash Feldspar500
Whiting200
either China Clay200
or Clay from the body 200
Bone ash100
+ Light Rutile50
Formula Seger formula from the Glaze Calculator
Application and Firing More interesting when applied over coloured slips. Suitable for raw glazing in an electric kiln up to 1250°C
Credits etc  

Copper Red (reduction)
Submitted by Louise Hummerstone
Recipe
Potash Feldspar301
Borax Frit35
Whiting47
+ Copper oxide1.5
+ Tin oxide4
Formula Seger formula from the Glaze Calculator
Application and Firing Reduction firing to 1280°C
Credits etc Janice Tchalenko

Opaque Stoneware cone 8-9
Submitted by Kazumi Harnett
Recipe
Cornish stone50
Whiting20
China clay15
Formula Seger formula from the Glaze Calculator
Application and Firing Semi opaque, smooth surface. Apply thinly. Good over coloured slips. Fire cone 8-9.
Credits etc from City Lit