Category: Glaze > Black
Created 2015-10-20 01:57:27 by Terry Rorison
Categories: Glaze > Black
Firing Temperature: Δ6
Atmospheres: Oxidation
Surface Type: Glossy
Transparency: Opaque
Material Amount Batch Subtotal
Frit 3134 26
Silica 26
Custer Feldspar 22
EPK 17
Talc (Theoretical) 5
Whiting 2
Bentonite 2
Total Base:100
Red iron oxide 9
Cobalt Carbonate 1
Total: 110

Percentage Analysis

Ingredient Amount SiO2 Al2O3 B2O3 MgO CaO K2O Na2O KNaO P2O5 Fe2O3 TiO2 CoO LOI
Frit 31342612.0965.232.672.67
Custer Feldspar2215.073.740.072.20.662.860.020.07
Talc (Theoretical)53.171.590.24
Red iron oxide98.550.45
Cobalt Carbonate10.630.37
100% no LOI 62.129.985.711.576.

Unity Molecular Formula (UMF)



0.23 Na2O
0.1 K2O
0.49 CaO
0.17 MgO


0.44 Al2O3
0.37 B2O3


4.62 SiO2


0.23 Fe2O3
0.04 CoO





0.34 : 0.66

SiO2:Al2O3 Chart

Closest 100 neighbors in Glaze > Black.

Click and drag to zoom
Stull Chart
SiO2:Al2O3 Ratio
SiO2:Al2O3 Ratio 10.55

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.

Arline Edmonds 2017-02-28 18:16:03
Whiting should be 4%, not 2%, for this version (Glossy Base 2) of Ron Roy Black.


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.
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
Talc (Theoretical) Harmful WARNING Causes mild skin irritation
Harmful if inhaled
May cause respiratory irritation
1 0 0 E
Whiting Harmful WARNING Causes eye irritation
Bentonite Harmful WARNING Causes eye irritation
Causes skin irritation
May cause respiratory irritation
Red iron oxide Health Hazard WARNING May cause damage to lung through prolonged or repeated exposure by inhalation
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 *