Terra Cotta C/04 #2

Redart 65
Kentucky OM #4 20
Frit 3134 5
Kona F-4 5
Silica 5
Grog 10

Na2O 1.2% Al2O3 20.8% SiO2 65.1%
K2O 3.1% B2O3 1.1% P2O5 0.1%
MgO 1.1% TiO2 1.1%
CaO 1.3% Fe2O3 5.1%

Volatiles: Other 5.4%
Loss On Ignition: 5.1%

Note : Good plasticity.
5% grog could be enough.