Category: Glaze > Green > Copper
Created 2017-05-10 03:03:52 by Erin Bjorkstedt
Categories: Glaze > Green > Copper
Firing Temperature: Δ9-10
Atmospheres: Reduction
Surface Type: Matte - Semi
Transparency: Opaque

Stumbled upon this recipe through experimentation, quite enjoyed the result. Great on stoneware, doesn't seem to run very much even when thick. Usually semi-matte but can get a sheen to it.

Material Amount Batch Subtotal
Silica 30.2
Custer Feldspar 28.4
Talc (Theoretical) 13.2
Laguna Borate 11
Dolomite 9.6
EPK 7.6
Total Base:100
Rutile 4.5
Red copper oxide 2
Total: 106.5

Percentage Analysis

Ingredient Amount SiO2 Al2O3 B2O3 MgO CaO K2O Na2O KNaO P2O5 Fe2O3 TiO2 Cu2O LOI
Custer Feldspar28.419.454.830.092.840.853.690.030.09
Talc (Theoretical)13.28.374.210.63
Laguna Borate112.050.893.
Red copper oxide22
100% no LOI 658.753.096.725.223.091.334.420.020.554.182.05

Unity Molecular Formula (UMF)



0.07 Na2O
0.11 K2O
0.3 CaO
0.53 MgO


0.27 Al2O3
0.14 B2O3


3.45 SiO2
0.17 TiO2


0.01 Fe2O3
0.05 Cu2O





0.17 : 0.83

SiO2:Al2O3 Chart

Closest 100 neighbors in Glaze > Green > Copper.

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Stull Chart
SiO2:Al2O3 Ratio
SiO2:Al2O3 Ratio 12.58

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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
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.
Talc (Theoretical) Harmful WARNING Causes mild skin irritation
Harmful if inhaled
May cause respiratory irritation
1 0 0 E
Laguna Borate
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
Rutile 1 0 0
Red copper oxide Harmful WARNING Harmful if swallowed