Category: Glaze
Created 2017-09-05 19:43:39 by Sue McLeod
Categories: Glaze
Firing Temperature: Δ6
Atmospheres: Oxidation, Reduction
Surface Type: Glossy
Transparency: Semi-opaque

Cedar Hill Studio new SJC turquoise/red recipe. Turquoise in oxidation. Dark Purple/Red in reduction.
Better chemistry than old SJC but still needs a lot work. Big changes in chemistry = big changes in colour.

Material Amount Batch Subtotal
Custer Feldspar 31
Silica 25
Frit 3269 22
Whiting 9
Kentucky OM #4 Ball Clay 9
Gerstley Borate 4
Total Base:100
Copper Carbonate 3
Total: 103

Percentage Analysis

Ingredient Amount SiO2 Al2O3 B2O3 MgO CaO ZnO K2O Na2O KNaO P2O5 Fe2O3 TiO2 CuO LOI
Custer Feldspar3121.
Frit 3269229.484.273.360.020.262.422.194.61
Kentucky OM #4 Ball Clay94.972.510.
Gerstley Borate40.590.
Copper Carbonate31.931.07
100% no LOI 64.2812.694.650.

Unity Molecular Formula (UMF)



0.23 Na2O
0.26 K2O
0.01 ZnO
0.47 CaO
0.02 MgO


0.52 Al2O3
0.28 B2O3


4.5 SiO2
0.01 TiO2


0.11 CuO





0.5 : 0.5

SiO2:Al2O3 Chart

Closest 100 neighbors in Glaze.

Click and drag to zoom
Stull Chart
SiO2:Al2O3 Ratio
SiO2:Al2O3 Ratio 8.59

Similar Base Recipes

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09/2016 Note: This is a new feature. If a recipe material is not listed, that material's data has not yet been added. Some materials only have GHS ratings, while others only have HMIS ratings. Warnings differ between systems and countries. Glazy does not take any responsibility for accuracy of linked SDS information. Contact your ceramics supplier for safety information for your specific materials.
Globally Harmonized System (GHS) Hazardous Materials Identification System (HMIS) SDS Link
Material Pictograms Signal Word Hazard Statements Health Flammability Hazard Protection
Custer Feldspar HarmfulHealth Hazard WARNING May cause damage to lungs through prolonged or repeated inhalation.
Suspected of causing cancer through
prolonged or repeated inhalation.
May cause allergy or asthma symptoms or breathing difficulties if inhaled.
May cause skin or eye irritation.
Silica HarmfulHealth Hazard DANGER From 200-Mesh SDS:
May cause cancer by inhalation.
Causes damage to lungs through prolonged or repeated exposure by inhalation.
* 0 0 E
Whiting Harmful WARNING Causes eye irritation
Kentucky OM #4 Ball Clay Health Hazard WARNING May cause damage to lung through prolonged or repeated inhalation 2 0 0 E
Gerstley Borate
Copper Carbonate Harmful WARNING Harmful if swallowed.
Causes skin irritation.
Causes serious eye irritation.