Stephanie Wright on mon 14 may 07
I got Mastering Cone 6 Glazes awhile back. GREAT book Ron and John! :-)
It's even gotten my usually die-hard ^10R instructor wanting to do some ^6
Oxidation firings in the school's electric kiln. And that is actually high
praise from him. ;-)
Anyway, I really love the Bone glaze in the book. It says that the color
was obtained by using 6% rutile. Please correct me if I am wrong, but
wouldn't using 6% rutile in a cone 10 base have a part in making the
firing in reduction either a yellow or a blue? What colorants can I use to
get that cream/bone color in reduction. I already use the Leach White from
John Britt's book with a great deal of success. Is there a colorant I can
add to that to change it from white to a bone color?
Thanks for any help you can give!
Stephanie
Eva Gallagher on tue 15 may 07
Hi Stephanie,
I have just finished doing a line blend with the Leach glaze in our gas kiln
and the tile that I find is somewhat like Bone (which with our rutile is a
quite nice yellow in the cone 6 elelctric) is with 5 rutile and 5 titanium.
At cone 10 it ends up a yellowy beige. It is yellower than just 10 rutile
and 5 rutile was a very bland grey-beige.- I did not use any Zircopax in the
glaze - but I think that perhaps that would give it a clearer yellow.
Hope this helps.
Eva Gallagher
Deep River, Ontario
----- Original Message -----
From: "Stephanie Wright"
To:
Sent: Monday, May 14, 2007 11:34 PM
Subject: M^6 Bone glaze - can color be reproduced for ^10R?
>I got Mastering Cone 6 Glazes awhile back. GREAT book Ron and John! :-)
> It's even gotten my usually die-hard ^10R instructor wanting to do some ^6
> Oxidation firings in the school's electric kiln. And that is actually high
> praise from him. ;-)
>
> Anyway, I really love the Bone glaze in the book. It says that the color
> was obtained by using 6% rutile. Please correct me if I am wrong, but
> wouldn't using 6% rutile in a cone 10 base have a part in making the
> firing in reduction either a yellow or a blue? What colorants can I use to
> get that cream/bone color in reduction. I already use the Leach White from
> John Britt's book with a great deal of success. Is there a colorant I can
> add to that to change it from white to a bone color?
>
> Thanks for any help you can give!
>
> Stephanie
>
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Ron Roy on tue 15 may 07
Hi Stephanie,
Rutile was often added to clay matte glazes to warm them up a bit - a short
line blend will tell you if this is what you want - and perhaps another
line blend with TiO2 and then a cross mix of the two.
Because titanium dioxide (rutile is over 90% TiO2) is so hard to melt it
also encourages recrystallization during cooling - giving crystals a seed
to grow on. It remains a crystal and that is why it is a good opacifier as
well.
Keep in mind - the bone glaze is a high calcium glaze so use one of those
to start with.
RR
>I got Mastering Cone 6 Glazes awhile back. GREAT book Ron and John! :-)
>It's even gotten my usually die-hard ^10R instructor wanting to do some ^6
>Oxidation firings in the school's electric kiln. And that is actually high
>praise from him. ;-)
>
>Anyway, I really love the Bone glaze in the book. It says that the color
>was obtained by using 6% rutile. Please correct me if I am wrong, but
>wouldn't using 6% rutile in a cone 10 base have a part in making the
>firing in reduction either a yellow or a blue? What colorants can I use to
>get that cream/bone color in reduction. I already use the Leach White from
>John Britt's book with a great deal of success. Is there a colorant I can
>add to that to change it from white to a bone color?
>
>Thanks for any help you can give!
>
>Stephanie
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
John Hesselberth on wed 16 may 07
Hi Stephanie,
Thanks for the positive comment about MC6Gs. As a starting point I
would remove the boron leaving the other unity numbers the same. You
will have to use glaze calculation software to do this easily (if you
don't know how to do this, drop me a note and I'll do if for you).
Then use the same rutile colorant that you are using for the C6
version. This is a large amount to try to adjust a glaze, though, so
test carefully and be prepared for some iterations before you get
what you want.
But I also can't resist asking the obvious question. If you are
getting what you want and like at C6 why would you make your life
more complicated and use considerably more energy by trying to
duplicate it at C10R??
Regards,
John
On May 14, 2007, at 11:34 PM, Stephanie Wright wrote:
> I got Mastering Cone 6 Glazes awhile back. GREAT book Ron and
> John! :-)
> It's even gotten my usually die-hard ^10R instructor wanting to do
> some ^6
> Oxidation firings in the school's electric kiln. And that is
> actually high
> praise from him. ;-)
>
> Anyway, I really love the Bone glaze in the book. It says that the
> color
> was obtained by using 6% rutile. Please correct me if I am wrong, but
> wouldn't using 6% rutile in a cone 10 base have a part in making the
> firing in reduction either a yellow or a blue? What colorants can I
> use to
> get that cream/bone color in reduction.
John Hesselberth
www.frogpondpottery.com
"Man is a tool-using animal....without tools he is nothing, with
tools he is all" .... Thomas Carlyle
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