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jeudi 24 mars 2011




















This Copper Red Engobe was made using dried Plainsman H-435, a light burning clay, to which 4.5% Black Copper Oxide was added. Naturally, it takes a lot of reduction to obtain this copper red color, if reduction is insufficeint you will get a nice medium green engobe. It was covered by a thick clear glaze whose composition is as follows :

Clear Glaze :
Custer Spar 43.5
Silica 28.1
Kaolin 10.3
Whiting 18.1
Total 100
Bentonite 1

Now, the composition of Plainsman H-435 :
BaO 0.5
CaO 0.2
K2O 2.1
MgO 0.5
Na2O 0.1
TiO2 0.6
Al2O3 16.9
P2O5 0.0
SiO2 69.8
Fe2O3 1.2
MnO 0.0
LOI 7.9%

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