Category: Glaze > Iron > Kaki, Tomato Red
Created 2004-12-27 08:00:00 by Glazy Admin
Categories: Glaze > Iron > Kaki, Tomato Red
Firing Temperature: Δ6
Atmospheres: Oxidation
Surface Type: Glossy
Transparency: Opaque

Glaze Type: Iron saturate
rio 11-17%
source: Michael Bailey, Glazes Cone 6 This is a "kaki" (plum) saturated iron red.
It can be a brilliant red-orange with just the right amount of iron. It does
better if you do a controlled cooling as it is a crystalline glaze and needs the
slow cool for the crystals to grow (fast cool will yield a chocolate brown
gloss).You have to do a line blend on this one to get it right as iron oxides are
never the same. I use Spanish red iron oxide. Generally increments of 1% RIO will
be fine. But, you really need to do the line blend to get the best red and to
fully appreciate the range of colors in that small range of RIO additions.
From Bill Buckner

Material Amount Batch Subtotal
Potash Feldspar (Theoretical) 46.7
Talc (Theoretical) 16.9
Bone Ash 15
Silica 11.4
Lithium Carbonate 4
Total Base:98
Red iron oxide 11
Bentonite 2
Total: 111

Percentage Analysis

Ingredient Amount SiO2 Al2O3 MgO CaO Li2O K2O Na2O KNaO P2O5 Fe2O3 TiO2 LOI
Potash Feldspar (Theoretical)46.730.248.567.97.9
Talc (Theoretical)16.910.715.390.8
Bone Ash158.376.360.27
Lithium Carbonate41.632.37
Red iron oxide1110.450.55
100% no LOI 52.139.845.117.911.537.470.067.5369.930.01

Unity Molecular Formula (UMF)



0.2 K2O
0.13 Li2O
0.35 CaO
0.32 MgO


0.24 Al2O3


2.17 SiO2


0.16 Fe2O3
0.11 P2O5





0.33 : 0.67

SiO2:Al2O3 Chart

Closest 100 neighbors in Glaze > Iron > Kaki, Tomato Red.

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Stull Chart
SiO2:Al2O3 Ratio
SiO2:Al2O3 Ratio 8.99

Similar Base Recipes

Δ5½ - 6

Similar RO/R2O Unity Formulas

Recipe Name ΔTemp Al2O3 B2O3 SiO2 ZrO2 SnO2 TiO2 KNaO K2O Na2O CaO MgO ZnO BaO PbO Li2O SrO
Orange Red 6 0.24 2.17 0.2 0.2 0.35 0.32 0.13
Bailey Red Orange 6 0.24 2.17 0.2 0.2 0.35 0.32 0.13
Penland Red Orange 6 0.25 2.17 0.18 0.06 0.12 0.38 0.31 0.13
Bailey Orange 6 0.24 2.18 0.2 0.2 0.35 0.32 0.13
C6 OR1 5½-6 0.24 2.18 0.2 0.2 0.35 0.32 0.13
Straw Yellow 6 0.24 2.2 0.2 0.2 0.35 0.32 0.13
Daniel Spruyt 2017-07-06 14:24:15
An interesting Iron red. Nice mottling/specs


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
Talc (Theoretical) Harmful WARNING Causes mild skin irritation
Harmful if inhaled
May cause respiratory irritation
1 0 0 E
Bone Ash
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
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
Lithium Carbonate Harmful WARNING Harmful if swallowed.
Causes serious eye irritation.
Harmful to aquatic life.
Red iron oxide Health Hazard WARNING May cause damage to lung through prolonged or repeated exposure by inhalation
Bentonite Harmful WARNING Causes eye irritation
Causes skin irritation
May cause respiratory irritation