Category: Glaze > Blue > Cobalt
Created 2016-08-30 08:31:31 by Triin Lehismets
Categories: Glaze > Blue > Cobalt
Firing Temperature: Δ6
Atmospheres: Oxidation
Surface Type: Glossy
Transparency: Translucent

Used gillespie borate instead of gerstley borate and zettlitzer kaolin instead of epk. Fired to 1235 celsius oxidation 25 min hold.

Material Amount Batch Subtotal
Silica 32.8
Nepheline Syenite Norwegian 24
Gillespie Borate 16.8
Strontium Carbonate 12
Zettlitzer kaolin 8
Wollastonite (Theoretical) 6.4
Total Base:100
Cobalt Carbonate 2
Total: 102

Percentage Analysis

Ingredient Amount SiO2 Al2O3 B2O3 MgO CaO SrO K2O Na2O KNaO Fe2O3 CoO LOI
Nepheline Syenite Norwegian2414.035.572.061.823.880.050.48
Gillespie Borate16.81.980.294.110.653.860.080.630.635.19
Strontium Carbonate128.423.58
Zettlitzer kaolin83.
Wollastonite (Theoretical)6.43.313.09
Cobalt Carbonate21.260.74
100% no LOI 61.399.94.530.727.669.352.262.694.950.121.39

Unity Molecular Formula (UMF)



0.14 Na2O
0.08 K2O
0.29 SrO
0.44 CaO
0.06 MgO


0.31 Al2O3
0.21 B2O3


3.28 SiO2


0.06 CoO
0.07 CuO





0.22 : 0.78

SiO2:Al2O3 Chart

Closest 88 neighbors in Glaze > Blue > Cobalt.

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Stull Chart
SiO2:Al2O3 Ratio
SiO2:Al2O3 Ratio 10.51

Similar RO/R2O Unity Formulas

Recipe Name ΔTemp Al2O3 B2O3 SiO2 ZrO2 SnO2 TiO2 KNaO K2O Na2O CaO MgO ZnO BaO PbO Li2O SrO
Kitten's Clear Blue 6 0.31 0.21 3.28 0.22 0.08 0.14 0.44 0.06 0.29
Bunty's British Variation of Kitten's Clear 5-6 0.3 0.21 3.27 0.21 0.04 0.17 0.44 0.06 0.29
Bunty's British Variation of Kitten's Clear Bermuda 5-6 0.3 0.21 3.27 0.21 0.04 0.17 0.44 0.06 0.29
Bunty's British Variation of Kitten's Clear Copper Green (variation) 5-6 0.3 0.21 3.27 0.21 0.04 0.17 0.44 0.06 0.29

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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
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
Strontium Carbonate Harmful WARNING Product dust may be irritating to eyes,skin and respiratory system.  1 0 0 E
Wollastonite (Theoretical) Health Hazard DANGER Vansil W-30 Wollastonite SDS:
May cause cancer if inhaled.
Causes damage to organs through prolonged or repeated exposure if inhaled. (respiratory tract)
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 *