David Hewitt on thu 5 sep 96
>Let's see if two brief responses can go into one message. For real
>research into copper reds in oxidation using Silicon Carbide, try
>Herbert Sanders' text Glazes for Special Effects, pp 52 - 66. If you
>can't find it, perhaps I can e-mail you some formulas.
>For Steve: Hamer's text should be in every potter's library. It is
>The Potter's Dictionary of Materials and Techniques, Watson-Guptil,
>1975.
There is a new edition of the Hamer's book, 'The Potter's Dictionary of
Materials and Techniques just out. It is the 4th Edition
If it is of interest, a common recipe for the so called Copper Red in
oxidation used over here is as follows. The key RM is Bone Ash. fire to
^8 or ^9
70 China Clay
520 Potash Feldspar
150 Flint or Quartz
25 Whiting
150 Bone Ash
100 Iron Oxide (red)
110 Talc
___
1125
K20 0.189 Al2O3 0.346 SiO2 2.820
Na2O 0.070 Fe2O3 0.178 P2O5 0.137
CaO 0.494 _____ _____
MgO 0.247 0.524 2.957
_____
1.000
David Hewitt
David Hewitt Pottery Caerleon, Newport, Gwent, UK.
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