Alisa Clausen on tue 30 sep 08
Dear Sally
Every reicpe I have from North America which calls for G.B. has been subbed
with Frit. When I first started subbing with Frit, it was not really
recognized, because Seger for the glazaes, are different. But it seems to be
common place now to do this. It is a local Boron frit I use., We had a lot
of discussions about this and my results a long time ago and I have never
missed not having access to G.B. I sub. gram for gram. Good luck!
Best regards from Alisa in Denmark
On Tue, Sep 30, 2008 at 12:54 AM, Sally Guger wrote:
> Yet another comment about floating blue: When I was newer to this list-I
> asked for a re-formulated Floating Blue because I didn't want to use up my
> pre-'99 Gerstley Borate on my beginning potters. So, Ron Roy gave me a
> recipe using Ferro Frit 3134 and I liked the end results just as much. Now I
> might go back to the original FB-because I don't feel like saving the GB
> forever. If anyone wants the recipe with Frit 3134 -I'll post it- it isn't
> one from the MC6 Glazes book. Sally.
>
>
>
>
>
>
>
> --- On Mon, 9/29/08, Ric Swenson wrote:
>
> From: Ric Swenson
> Subject: Re: Rutile blue; a question!!!
> To: CLAYART@LSV.CERAMICS.ORG
> Date: Monday, September 29, 2008, 7:16 AM
>
> the clue to 'floating blue' is probably the colemanite. boron..... The
> rutile is essential....but the real effect of floating blue is probably
> from the
> colemanite.....in large part.
>
>
> reactions?
>
>
>
>
>
> Ric
>
>
> "...then fiery expedition be my wing, ..." -Wm. Shakespeare, RICHARD
> III, Act IV Scene III Richard H. ("Ric") Swenson, Teacher, Office of
> International Cooperation and Exchange of Jingdezhen Ceramic Institute,
> TaoYang
> Road, Eastern Suburb, Jingdezhen City.JiangXi Province, P.R. of China.
> Postal
> code 333001. Mobile/cellular phone : 86 13767818872 <
> RicSwenson0823@hotmail.com> http://www.jci.jx.cn/http://www.ricswenson.com
>
>
>
> > Date: Sun, 28 Sep 2008 17:05:58 +0930> From: iandol@WESTNET.COM.AU>
> Subject: Rutile blue; a question!!!> To: CLAYART@LSV.CERAMICS.ORG> >
> Dear Lili,> I had a look in Chappell, page 186 which gives the Floating
> Glaze> recipe. It contains Red Iron oxide, Cobalt oxide and Milled Rutile.
> It> also contains Colemanite, a rich source of Boron.> I would suggest the
> science of this glaze is complex. It contains two> glass forming oxides,
> Silicon Dioxide and Boric Oxide. Other oxides> are Soda, Potash and Lime.
> According to Kingery et al these modifying> oxides, especially those of the
> Alkali Earth Group like Calcium oxide,> influence what happens, promoting
> two
> glasses which do not mix. When> the inclusions of one glass in the other
> are
> of a favourable size> there is an optical effect. The glaze becomes
> opalescent and blue. In> effect, it has properties similar to those of a
> Chun
> or Jun style> glaze.> What should be expected of The Rutile content ?
> Under normal> circumstances this is an opacifier, so it either does not
> enter
> into> any reactions with other ingredients or it precipitates on cooling.>
> Why Cobalt in this recipe ? Possibly to guarantee getting a blue if>
> conditions are not just quite right in the kiln to deliver the desired>
> effect !> A good source of information relating to opalescence in glazes
> is> Nigel Wood,"Chinese Glazes". ISBN 90-5703-23-25.> Best
> regards,> Ivor Lewis.> Redhill,> South Australia.
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Ron Roy on thu 2 oct 08
There are many frits - when subbing for GB it would be best to choose frits
that have the right oxides and the right amounts of boron and calculate the
substitution if you want the glaze to look the same.
Just to give an example - GB has between 25 and 30% boron - frit 3134 has
23% boron and frit 3124 only has 13% boron. As you can see - 3134 would be
the better of the two.
Also 3134 has no alumina - and 3124 has lots. GB helps suspend a glaze - if
you take it out it would be an advantage to be able to add more clay - so -
again 3134 would be a better choice.
RR
>Dear Sally
>Every reicpe I have from North America which calls for G.B. has been subbed
>with Frit. When I first started subbing with Frit, it was not really
>recognized, because Seger for the glazaes, are different. But it seems to be
>common place now to do this. It is a local Boron frit I use., We had a lot
>of discussions about this and my results a long time ago and I have never
>missed not having access to G.B. I sub. gram for gram. Good luck!
>
>Best regards from Alisa in Denmark
Ron Roy
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
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