Category: Glaze
Created 2017-08-31 23:44:22 by Tom Demeranville
Categories: Glaze
Firing Temperature: Δ6-7
Atmospheres: Oxidation
Surface Type: Matte

Variation on GA 23 (Crystal White) - originally credited as Val Cushing Pam Fredericks Satin matte. aka rusty bronze (

Much runnier when on white slip or white clay compared to my regular buff body, no idea why. Much drier as well.

Looks AWFUL without titanium.

Discussion here:
Original hooper variant:
Neph Sy 40
Gerstley Borate 10
EPK 12
Whiting 10
Lithium Carb 5
Flint 15
Titanium Dioxide 6

Material Amount Batch Subtotal
Nepheline Syenite (Theoretical) 40.82
Silica 15.3
Devon China Clay 12.24
Gillespie Borate 10.21
Whiting 10.21
Titanium Dioxide 6.12
Lithium Carbonate 5.1
Total: 100

Percentage Analysis

Ingredient Amount SiO2 Al2O3 B2O3 MgO CaO SrO Li2O K2O Na2O KNaO Fe2O3 TiO2 LOI
Nepheline Syenite (Theoretical)40.8224.789.510.040.291.8845.880.040.29
Devon China Clay12.245.754.570.
Gillespie Borate10.
Titanium Dioxide6.126.12
Lithium Carbonate5.12.083.02
100% no LOI 53.6916.272.850.539.560.052.372.485.

Unity Molecular Formula (UMF)



0.22 Na2O
0.07 K2O
0.21 Li2O
0.46 CaO
0.04 MgO


0.43 Al2O3
0.11 B2O3


2.41 SiO2
0.24 TiO2





0.5 : 0.5

SiO2:Al2O3 Chart

Closest 100 neighbors in Glaze.

Click and drag to zoom
Stull Chart
SiO2:Al2O3 Ratio
SiO2:Al2O3 Ratio 5.6

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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
Whiting Harmful WARNING Causes eye irritation
Titanium Dioxide Health Hazard WARNING Suspected of causing cancer
Lithium Carbonate Harmful WARNING Harmful if swallowed.
Causes serious eye irritation.
Harmful to aquatic life.