Category: Glaze > Blue
Created 2015-10-20 02:00:13 by Terry Rorison
Categories: Glaze > Blue
Firing Temperature: Δ6
Atmospheres: Oxidation
Surface Type: Glossy
Transparency: Opaque
Material Amount Batch Subtotal
Custer Feldspar 45.2
Silica 18
Dolomite 14.2
Gillespie Borate 11.4
EPK 5.2
Zinc Oxide 5
Bentonite 2
Total Base:101
Copper Oxide 2.5
Cobalt Oxide 2.5
Total: 106

Percentage Analysis

Ingredient Amount SiO2 Al2O3 B2O3 MgO CaO SrO ZnO K2O Na2O KNaO P2O5 Fe2O3 TiO2 CoO CuO LOI
Custer Feldspar45.230.967.680.144.521.365.880.050.14
Gillespie Borate11.41.340.192.790.442.620.050.430.433.52
Zinc Oxide55
Copper Oxide2.52.5
Cobalt Oxide2.52.330.17
100% no LOI 57.2610.872.973.837.560.055.314.841.976.810.

Unity Molecular Formula (UMF)



0.08 Na2O
0.14 K2O
0.17 ZnO
0.36 CaO
0.25 MgO


0.28 Al2O3
0.11 B2O3


2.52 SiO2


0.09 CoO
0.09 CuO





0.22 : 0.78

SiO2:Al2O3 Chart

Closest 100 neighbors in Glaze > Blue.

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Stull Chart
SiO2:Al2O3 Ratio
SiO2:Al2O3 Ratio 8.93

Similar Base Recipes

No recipes with similar base ingredients and amounts were found.

Similar RO/R2O Unity Formulas

No recipes with similar RO/R2O Unity Formulas were found.

Daniel Spruyt 2017-07-06 14:26:19
A rather dark blue, smooth and shiny. (With my materials) To be used on a white clay.


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
Dolomite Health Hazard DANGER May cause cancer (Inhalation) 1 0 0 E
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
Zinc Oxide 0 0 0 *
Bentonite Harmful WARNING Causes eye irritation
Causes skin irritation
May cause respiratory irritation
Copper Oxide Harmful WARNING Harmful if swallowed 2 0 0 E
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 *