Category: Glaze
Created 2017-09-05 02:03:51 by Sue McLeod
Categories: Glaze
Firing Temperature: Δ6
Atmospheres: Oxidation
Surface Type: Matte
Transparency: Opaque

Cedar Hill Studio new Black Matte recipe, replaces old Black matte that was underfired at cone 6.

Material Amount Batch Subtotal
Custer Feldspar 30
Frit 3124 28
EPK 14
Whiting 10
Nepheline Syenite (Theoretical) 8
Calcined Kaolin 6
Zinc Oxide 4
Total Base:100
Red iron oxide 9
Cobalt Oxide 2
Total: 111

Percentage Analysis

Ingredient Amount SiO2 Al2O3 B2O3 MgO CaO ZnO K2O Na2O KNaO P2O5 Fe2O3 TiO2 CoO LOI
Custer Feldspar3020.555.10.0930.
Frit 31242815.482.773.853.940.191.761.95
Nepheline Syenite (Theoretical)84.861.860.010.060.370.781.150.010.06
Calcined Kaolin63.252.75
Zinc Oxide44
Red iron oxide98.550.45
Cobalt Oxide21.870.13
100% no LOI 48.817.113.720.029.393.863.483.336.820.048.390.051.8

Unity Molecular Formula (UMF)



0.18 Na2O
0.12 K2O
0.15 ZnO
0.55 CaO


0.55 Al2O3
0.17 B2O3


2.66 SiO2


0.17 Fe2O3
0.08 CoO





0.3 : 0.7

SiO2:Al2O3 Chart

Closest 100 neighbors in Glaze.

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Stull Chart
SiO2:Al2O3 Ratio
SiO2:Al2O3 Ratio 4.84

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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.
EPK HarmfulHealth Hazard DANGER EPK Kaolin is a naturally occurring mineral, which may contain amounts of crystalline silica
typically 0.1-1.0%, may cause damage to respiratory system through prolonged or repeated
1 0 0 E
Whiting Harmful WARNING Causes eye irritation
Zinc Oxide 0 0 0 *
Red iron oxide Health Hazard WARNING May cause damage to lung through prolonged or repeated exposure by inhalation
Cobalt Oxide HarmfulHealth Hazard WARNING Suspected of causing cancer
Harmful if swallowed
May cause allergy or breathing difficulties if inhaled
May cause an allergic skin reaction
2 0 0 *