Category: Glaze > Crystalline > Manganese
Created 2017-10-02 21:17:06 by Ken Potter
Categories: Glaze > Crystalline > Manganese
Firing Temperature: Δ6-10
Atmospheres: Oxidation, Neutral, Reduction

My version of Stengods-Ostman Glaze 2.
I used Redart instead of Albany Slip and used Copper carbonate instead of the oxide.
The test tile shown was fired to cone 10 in reduction.
This glaze is runny, so use with caution.

Material Amount Batch Subtotal
Redart 40
Custer Feldspar 30
Manganese Dioxide 26
Copper Carbonate 3
Cobalt Carbonate 3
Total: 102

Percentage Analysis

Ingredient Amount SiO2 Al2O3 MgO CaO K2O Na2O KNaO P2O5 Fe2O3 TiO2 MnO2 CoO CuO LOI
Custer Feldspar3020.555.10.0930.
Manganese Dioxide2622.593.41
Copper Carbonate31.931.07
Cobalt Carbonate31.891.11
100% no LOI 49.41120.680.214.951.

Unity Molecular Formula (UMF)



0.2 Na2O
0.58 K2O
0.04 CaO
0.18 MgO


1.29 Al2O3


9.03 SiO2
0.06 TiO2


0.21 Fe2O3
3.02 MnO2
0.01 P2O5
0.29 CoO
0.28 CuO





0.78 : 0.22

SiO2:Al2O3 Chart

Closest 6 neighbors in Glaze > Crystalline > Manganese.

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Stull Chart
SiO2:Al2O3 Ratio
SiO2:Al2O3 Ratio 6.98

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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
Redart HarmfulHealth Hazard DANGER Causes skin irritation
Causes eye irritation
May cause cancer (Inhalation)
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.
Manganese Dioxide Harmful WARNING Harmful if swallowed. Causes serious eye irritation. Harmful if inhaled. May cause respiratory
Copper Carbonate Harmful WARNING Harmful if swallowed.
Causes skin irritation.
Causes serious eye irritation.
Cobalt Carbonate Health HazardEnvironmental Hazard DANGER May cause cancer
Suspected of causing genetic effects
May damage fertility or the unborn child
May cause allergy or breathing difficulties if inhaled
May cause a allergic skin reaction
Very toxic to aquatic life
Very toxic to aquatic life with long lasting effects
2 0 0 *