Jenni Meredith on thu 22 jun 06
Hi
I am looking at painting with colouring oxides and then glazing with a
transparent matt glaze and wondered if anyone has any tips as this is the
first time I am using oxides.
I was reading that if you use copper with alkaline frit you can get
turquoise colours and wondered if it is possible to do this by mxing a
paste of oxide, alkalione frit and glaze binder to paint onto the pots?
Will the chemical reaction work that way? Or di I need to make an alkaline
galze and add copper?
I also read in the archives about local reduction and have Harry
Fraser's book where he suggests you can use magnesium silicaet to get
some reds from copper as it uses oxygen in some chemicals preferentially
so making a localised reduced atmosphere.
Again could it be possible to do this by mixing a paste of Mg Silicate
and glaze binder to paint over some of the copepr oxide appleid to the
are and get greens and reds firing in an electric kiln?
perhpas my suggestions are nonsense and if so please can the chemical
edperts amonsgt you put me straight?
Thanks
Jenni
Essex
England
Ivor and Olive Lewis on sat 24 jun 06
Dear Jenni Meredith,=20
I can find nothing in Harry Frazer's book about Magnesium Silicate. I =
doubt if this would have any use as a glaze ingredient since it has such =
a high melting point, far beyond the temperatures we fire pottery at. =
But he does give a rather scanty description of Arabian Lustre process =
on p 99.
Perhaps you need to read a more up to date book about glazing. One of =
the best is by Cooper and Royle, "Glazes for the Studio Potter" or try =
Hutchinson-Cuff, Ceramic Technology for Potters and Sculptors".
Best regards,
Ivor Lewis.
Redhill,
South Australia.
Ron Roy on wed 28 jun 06
Try Talc - a well known fluxer for midrange and above glazes and bodies.
RR
>Dear Jenni Meredith,
>
>I can find nothing in Harry Frazer's book about Magnesium Silicate. I
>doubt if this would have any use as a glaze ingredient since it has such a
>high melting point, far beyond the temperatures we fire pottery at. But he
>does give a rather scanty description of Arabian Lustre process on p 99.
>
>Perhaps you need to read a more up to date book about glazing. One of the
>best is by Cooper and Royle, "Glazes for the Studio Potter" or try
>Hutchinson-Cuff, Ceramic Technology for Potters and Sculptors".
>
>Best regards,
>
>Ivor Lewis.
>Redhill,
>South Australia.
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Jenni Meredith on thu 6 jul 06
Hello everyone and many thanks for the responses to my question about
oxides. The new kiln lid seal arrived last week but it has been too hot
for firing. I should be able to try a few experiments at the end of this
week, though.
And thanks to Ivor and Olive Lewis for putting me right about the
chemicals. I got the wrong one entirly there didn't I? I must have been
thinking about the extra talc in a Magma body I was trying!!!
The piece I was referring to in Harry Frasers book relates to localised
reduction using silcon carbide?? as it uses the oxygen preferentially.
I wonder if you get the effect by using a glaze that includes that? Or
could you add it to some binder and paint it where you want reduction
effects to occur?
Has anyone used it in an electric kiln to get reduction colours from
copper or iron?
Thanks
Jenni
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