The titanium marbling effect in stained ceramic glazes

Share from (Lab Documentation and Calculation System) by Digitalfire.

This is a project to see if we can make this work in high MgO glazes across the entire temperature range (from cone 10 down to cone 04). We will work from the top downward.

Cone 10 Marbled Red Glaze

Code #


Materials Amt
Wollastonite 21.000
Custer Feldspar 32.000
EP Kaolin 20.000
Calcined Kaolin 9.000
Talc 14.000
Fusion Frit F-69 4.000
Titanium 3.000
*Mason 6021 Red Stain 6.000


Auto Unity Formula

CaO 0.51
MgO 0.35
K2O 0.10
Na2O 0.04
(KNaO) 0.14
TiO2 0.11
B2O3 0.05
Al2O3 0.48
SiO2 2.68


Si:Al: 5.6:1
SiB:Al: 5.7:1
R2O:RO: 0.1:0.9


6.8 (Molar:6.4)




0.80 per kg


*This adds titanium and red stain to the new fritted base of G2571B. Fabulous results. The amount of titanium in the previous test was too little high (losing a bit of the silky feel of the surface), this reduces it to 3%. This also increases the red stain from 5 to 6.

2000 water and 2000 powder worked well.

Mar 2023: Tests were done to dilute this up to 50:50. The diluted versions do give a better quality surface yet still have good color.


G2571D1 on P600, H550

Pinholes on porcelain?

G2571D1 on H550, H570 at cone 10R

L4475B P600 cone 10ox mug

Glaze is G2571D1 and G3910A
Cone 10ox firing, drop and hold firing but not slow cool.

This crazed after a week.

L4476 H570 mug cone 10ox firing

Glaze is G2571D1 and G3910A
Cone 10ox firing, drop and hold firing but not slow cool.
G3910A crazed over time.

G2571D1 Cone 10 Marbled refire

G2571D1 3.4% titanium


ST-Untitled typecode

Alternate Code Number:GS10-G

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Cone 10 Marbled Red Glaze" id="205487" key="2GGeCQLA" date="2023-04-04" typecodes="ST" codenum="G2571D1" picturebasename=""> <recipelines> <recipeline material="Wollastonite" amount="21.000" tolerance=""/> <recipeline material="Custer Feldspar" amount="32.000" tolerance=""/> <recipeline material="EP Kaolin" amount="20.000" tolerance=""/> <recipeline material="Calcined Kaolin" amount="9.000" tolerance=""/> <recipeline material="Talc" amount="14.000" tolerance=""/> <recipeline material="Fusion Frit F-69" amount="4.000" tolerance=""/> <recipeline material="Titanium" amount="3.000" added="true"/> <recipeline material="Mason 6021 Red Stain" amount="6.000" added="true"/> </recipelines> </recipe> </recipes>

Born: 2006-03-16, Modified: 2023-04-04 14:06:14

Cone 6 Oxidation Marbled Red

Code #


Materials Amt
G2934 90.000
G2926B 10.000
Titanium 6.000
Mason 6021 8.000



*The titanium/stain marbling mechanism works well in our G2571A cone 10 high-MgO silky matte glaze. But does it work at cone 6 in the G2934 MgO matte? That is what this investigates.

We are using a 90:10 matte:glossy mix to start. From prior experience, it seemed evident that more titanium would be needed o induce the effect, so we started with 4.5% (and 8% stain).

However, from the photo below it is clear that more titanium was needed, thus the 6% in this recipe.


The difference between 4.5 and 6% titanium

G3939 vs G3939A

G3939A Marbled Red on dark clay

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Cone 6 Oxidation Marbled Red" id="214641" key="WRvZ86Qw" date="2022-07-19" codenum="G3939A"> <recipelines> <recipeline material="G2934" amount="90.000" tolerance=""/> <recipeline material="G2926B" amount="10.000" tolerance=""/> <recipeline material="Titanium" amount="6.000" added="true"/> <recipeline material="Mason 6021" amount="8.000" added="true"/> </recipelines> </recipe> </recipes>

Born: 2022-01-09, Modified: 2022-07-19 12:20:48