Category: Glaze > Iron > Tenmoku, Temmoku
Created 2017-05-02 01:20:16 by Nate Willever
Categories: Glaze > Iron > Tenmoku, Temmoku
Firing Temperature: Δ9-12
Atmospheres: Reduction, Salt & Soda, Wood
Surface Type: Glossy - Semi

Good Tenmoku for the wood kiln

Material Amount Batch Subtotal
Custer Feldspar 77
Gerstley Borate 12.5
Whiting 6.25
EPK 4.25
Total Base:100
Red iron oxide 7.5
Total: 107.5

Percentage Analysis

Ingredient Amount SiO2 Al2O3 B2O3 MgO CaO K2O Na2O KNaO P2O5 Fe2O3 TiO2 LOI
Custer Feldspar7752.7513.
Gerstley Borate12.51.850.133.350.442.420.050.50.550.
Red iron oxide7.57.130.38
100% no LOI 56.9814.923.380.456.227.832.8410.660.027.340.03

Unity Molecular Formula (UMF)



0.18 Na2O
0.33 K2O
0.44 CaO
0.04 MgO


0.59 Al2O3
0.19 B2O3


3.8 SiO2


0.18 Fe2O3





0.52 : 0.48

SiO2:Al2O3 Chart

Closest 81 neighbors in Glaze > Iron > Tenmoku, Temmoku.

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Stull Chart
SiO2:Al2O3 Ratio
SiO2:Al2O3 Ratio 6.48

Similar Base Recipes

No recipes with similar base ingredients and amounts were found.

Similar RO/R2O Unity Formulas

Recipe Name ΔTemp Al2O3 B2O3 SiO2 ZrO2 SnO2 TiO2 KNaO K2O Na2O CaO MgO ZnO BaO PbO Li2O SrO
Unzicker Brothers Tenmoku 9-12 0.59 0.19 3.8 0.51 0.33 0.18 0.44 0.04
Hamada Rust 9-11 0.59 0.19 3.83 0.51 0.33 0.18 0.44 0.04
chance taylor 2017-11-19 21:17:41
Very good results in soda, good color variation and interaction with the soda. In wood it went very black and matte in some places.
Tom Unzicker 2018-01-16 16:44:47
Ha! ... I love this glaze and am very happy to be associated with it, however,I had never heard of "Unzicker Brothers Tenmoku" before I saw it here! Thanks for the credit Nate, just sorry we can't claim it as ours. We have always known it as Hamada rust. We have had best results using it a bit thin over white stoneware in the wood kiln.(as shown in the cup image on the site) Seems to work best with a moderate amount of ash in hotter parts of the kiln-- usually second shelf back from the firebox toword the top of the stack in our anagama style kiln.


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.
Gerstley Borate
Whiting Harmful WARNING Causes 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
Red iron oxide Health Hazard WARNING May cause damage to lung through prolonged or repeated exposure by inhalation