Terra Cotta C/04 #40

Bell Dark ball clay 18
Kentucky OM #4 18
Silica 25
Talc 6
Kona F-4 28
QIT Red Dust 5
Bentonite 2

Na2O 2.1% Al2O3 16.2% SiO2 71.0%
K2O 1.6% TiO2 0.6%
MgO 2.1% Fe2O3 4.9%
CaO 1.4%
MnO 0.0%
ZnO 0.1%

Volatiles: CO2 0.1%
Other 4.7%
Loss On Ignition: 4.5%

Note : Too plastic. Bentonite should be reduced to 1% in a first step.