Earthenware Glazes
(1000°C to 1150°C)

Submitted by

Jane Bridger

Recipe

Borax frit	52
China Clay	16
Cornish Stone	27
Whiting	50

Formula

Seger formula from the Glaze Calculator 1 : 0.18 : 1.26

Application and Firing

With the addition of 2% copper carbonate the glaze becomes a bright greenish turqouise, which is clear, glossy and stable. With the addition of 1% cobalt oxide, 2.5% tin oxide, 2.5% titanium and 0.5% copper oxide the glaze becomes a medium blue and opaque. For a dark blue transparent, add 2% cobalt. These glazes fire to 1100°C. in an electric kiln, preferably with a 45 minute soak at top temperature. The turquoise glaze is the one that I use for my pots with the black fish.

Credits etc

This glaze was originally gleaned from a book and the potter who subscribed it was John Solly.

Submitted by

Jean McCree

Recipe

Lead Bisilicate	70
China Clay	10
Cornish Stone	20

Formula

Seger formula from the Glaze Calculator 1 : 0.33 : 2.65

Application and Firing

A stable, craze resistant clear gloss with a firing range of 1080°C to 1100°C. Jean uses this on non-food bearing surfaces.

Credits etc

Tunbridge Wells Adult Education Centre

Submitted by

Peter Hackford

Recipe

Standard Borax Frit	60
China Clay	14
Cornish Stone	21
Whiting	5

Formula

Seger formula from the Glaze Calculator 1 : 0.35 : 2.73

Application and Firing

A dependable base glaze, 1080°C to 1140°C. Add 5% Red Iron Oxide for honey, or 5% Tin oxide for white.

Credits etc

John Solly

Submitted by

Eva Blume

Recipe

Lead bisilicate	58
Borax frit	30
Feldspar	3
China clay	9
Bentonite	2

Formula

Seger formula from the Glaze Calculator 1 : 0.35 : 2.73

Application and Firing

This glaze is very shiny but crazes easily. It needs to be put on very thinly and fires best at higher temperatures. I use the glaze on its own or as a base glaze with added colouring oxides or stains. Range: 1060 - 1160 °C

Credits etc

 

Submitted by

Helen Komatsu

Recipe

Lead bisilicate	60
Feldspar	20
China clay	5
Flint	5
Tin oxide	4
Zirconium oxide	3
Titanium oxide	3

Formula

Seger formula from the Glaze Calculator 1 : 0.33 : 3.42

Application and Firing

 

Credits etc

The Potter's Dictionary of Materials and Techniques by Frank and Janet Hamer. University of Pennsylvania Press; 5th edition (May 26, 2004)