iandol on sun 6 oct 02
Has anyone thought of doing some tests with high proportions of Vanadium =
Pentoxide (Additions between 5% and 10% seem to be in order) allied with =
Tin in a high fired glaze which contains good solvent melters and a =
lower proportion of refractory viscosity modifiers.
Were I called upon to design a yellow glaze, this would be my starting =
point. In fact, since I am starting a series of fundamental tests I =
might give this a whirl.
Best regards to all,
Ivor Lewis. Redhill, South Australia.
Chris Rupp on mon 7 oct 02
The one thing I do know fo sure about Otto's lost yellow glaze is the fact
that he uses Spainish iron which is 99% pure. He mentioned that the iron
content is very important and he uses the purest iron available to him.
Also, the glaze is pink before firing. It should be noted that the glaze is
VERY close to the color of yellow butter and it is a MATTE GLAZE, it is not
glossy at all. Good luck.
>
>Has anyone thought of doing some tests with high proportions of Vanadium
>Pentoxide (Additions between 5% and 10% seem to be in order) allied with
>Tin in a high fired glaze which contains good solvent melters and a lower
>proportion of refractory viscosity modifiers.
>Were I called upon to design a yellow glaze, this would be my starting
>point. In fact, since I am starting a series of fundamental tests I might
>give this a whirl.
>Best regards to all,
>Ivor Lewis. Redhill, South Australia.
>
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June Perry on tue 8 oct 02
Chris, I also think that colorant is iron. When Vivika was alive she gave me
a recipe of the yellow she was using on her little porcelain bud vases. She
was using it at that time, with some rutile and iron to get a more peachy
cast to the yellow. She also had a blue variation of it.
I played with the oxides and got a good yellow and I suspect that the base
she gave me in the 80's may be the one Otto is using now, or maybe it was the
starting point for the one he now uses. I'll have to ask him some time.
I also think that the wood firing helps to intensify the yellow.
Regards,
June Perry
http://www.angelfire.com/art2/shambhalapottery/index.html
Ron Roy on wed 9 oct 02
If anyone is contemplating getting into Vanadium it would be advisable to
look up the health concerns associated - you need a lot of this stuff to
get significant results.
RR
>Has anyone thought of doing some tests with high proportions of Vanadium
>Pentoxide (Additions between 5% and 10% seem to be in order) allied with
>Tin in a high fired glaze which contains good solvent melters and a lower
>proportion of refractory viscosity modifiers.
>Were I called upon to design a yellow glaze, this would be my starting
>point. In fact, since I am starting a series of fundamental tests I might
>give this a whirl.
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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