Category: Glaze > Crystalline > Macro
Created 2017-10-10 06:49:53 by Triin Lehismets
Categories: Glaze > Crystalline > Macro
Firing Temperature: Δ6-7
Atmospheres: Oxidation
Surface Type: Glossy
Transparency: Semi-opaque

Crystalline glaze from John Britt mid-range glaze book.

Firing schedule:
1. 232 min to 600C
2. fast to 1222C - 30 min hold
3. cool to 1100C - 90 min hold
4. cool to 1066C - 120 min hold
5. fast to 1020C - 90 min hold
6. cool to 996C - hold 45 min
7. fast to 1020C - hold 45 min
8. cool to 996C - hold 45 min

Test tile is white stoneware (Goerg&Schneider 208)

Material Amount Batch Subtotal
Frit 3110 54.2
Zinc Oxide 24.1
Silica 17.3
Gillespie Borate 3.3
Lithium Carbonate 1.1
Total Base:100
Titanium Dioxide 7
Bentonite 2
Copper Carbonate 2
Total: 111

Percentage Analysis

Ingredient Amount SiO2 Al2O3 B2O3 MgO CaO SrO ZnO Li2O K2O Na2O KNaO Fe2O3 TiO2 CuO LOI
Frit 311054.
Zinc Oxide24.124.1
Gillespie Borate3.30.390.060.810.130.760.
Lithium Carbonate1.10.450.65
Titanium Dioxide77
Copper Carbonate21.290.71
100% no LOI 50.853.432.190.163.540.0122.230.411.747.739.470.066.461.19

Unity Molecular Formula (UMF)



0.25 Na2O
0.04 K2O
0.03 Li2O
0.55 ZnO
0.13 CaO
0.01 MgO


0.07 Al2O3
0.06 B2O3


1.7 SiO2
0.16 TiO2


0.03 CuO





0.32 : 0.68

SiO2:Al2O3 Chart

Closest 1 neighbors in Glaze > Crystalline > Macro.

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Stull Chart
SiO2:Al2O3 Ratio
SiO2:Al2O3 Ratio 25.13

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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
Zinc Oxide 0 0 0 *
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
Lithium Carbonate Harmful WARNING Harmful if swallowed.
Causes serious eye irritation.
Harmful to aquatic life.
Titanium Dioxide Health Hazard WARNING Suspected of causing cancer
Bentonite Harmful WARNING Causes eye irritation
Causes skin irritation
May cause respiratory irritation
Copper Carbonate Harmful WARNING Harmful if swallowed.
Causes skin irritation.
Causes serious eye irritation.