Neal on mon 29 sep 08
For my floating blue, I've been using my variation
of Tony Hanson's 1215H variation of his 20x5 glossy
base glaze:
Wollastonite 17
Frit 3134 18
EPK 21
Silica 24
Custer Feldspar 17
Lithium Carbonate 2
---
Total 99
Cobalt carb 0.5
Light rutile 3
Red iron oxide 1
The original 1215H variation calls for 3 percent
lithium carbonate. Using just 2 percent solved the
crazing problem I was having with the original
20x5 glaze.
Unfortunately for my last batch I tried subbing some
yellow ochre for the RIO at 20 percent more. Obviously
in retrospect, I should have waited until I had more
RIO on hand. That substitution btw worked out OK in
the cone 6 tenmoku glaze I use.
My original recipe (and I mean that in the sense of
the recipe as written above with my adaptations and
not in the sense that I want to claim credit for
coming up with it on my own) is not quite as floating
as the floating blue I used at the city art centers.
That glaze, attributed to Steve Loucks, used
1 percent cobalt carb, 4 rutile, and 2 RIO.
I may test adding additional cobalt carb, rutile and
RIO to the newest batch to see if it can be salvaged.
By then, I'll have a batch that I can probably never
duplicate again.
Neal O'Briant
Raleigh, N.C.
Sally Guger on mon 29 sep 08
Yet another comment about floating blue: When I was newer to this list-I as=
ked for a re-formulated Floating Blue because I didn't want to use up my pr=
e-'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 migh=
t go back to the original FB-because I don't feel like saving the GB foreve=
r.=A0 If anyone wants the recipe with Frit 3134 -I'll post it- it isn't one=
from the MC6 Glazes book. Sally.
=A0
--- 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 fro=
m the
colemanite.....in large part.
=20
=20
reactions?
=20
=20
=20
=20
=20
Ric
=20
=20
"...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, Tao=
Yang
Road, Eastern Suburb, Jingdezhen City.JiangXi Province, P.R. of China. Post=
al
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 t=
wo
glasses which do not mix. When> the inclusions of one glass in the other ar=
e
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 Ch=
un
or Jun style> glaze.> What should be expected of The Rutile content ?
Under normal> circumstances this is an opacifier, so it either does not ent=
er
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.
_________________________________________________________________
Connect to the next generation of MSN Messenger=A0
http://imagine-msn.com/messenger/launch80/default.aspx?locale=3Den-us&sourc=
e=3Dwlmailtagline=0A=0A=0A
Josh Berkus on tue 30 sep 08
On Monday 29 September 2008 18:59, Neal wrote:
> Light rutile =A0 =A0 =A0 3
What the heck is "light" rutile?
=2D-=20
Josh "the Fuzzy" Berkus
San Francisco
Pat Southwood on wed 1 oct 08
I found a big bag of "rutile flour " whilst tidying up today.
I presume this is the same as light rutile.
?
Pat Southwood
----- Original Message -----
From: "Josh Berkus"
To:
Sent: Wednesday, October 01, 2008 6:28 AM
Subject: Re: Rutile blue; without GB
On Monday 29 September 2008 18:59, Neal wrote:
> Light rutile 3
What the heck is "light" rutile?
--
Josh "the Fuzzy" Berkus
San Francisco
Jones, Nina D. on thu 2 oct 08
Hi, Pat! "Rutile flour" is powdered rutile.
Nina
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Pat Southwood
Sent: Wednesday, October 01, 2008 4:45 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: Rutile blue; without GB
I found a big bag of "rutile flour " whilst tidying up today.
I presume this is the same as light rutile.
?
Pat Southwood
----- Original Message -----
From: "Josh Berkus"
To:
Sent: Wednesday, October 01, 2008 6:28 AM
Subject: Re: Rutile blue; without GB
On Monday 29 September 2008 18:59, Neal wrote:
> Light rutile 3
What the heck is "light" rutile?
--
Josh "the Fuzzy" Berkus
San Francisco
The contents of this message may be privileged and confidential. Therefore,=
if this message has been received in error, please delete it without=
reading it. Your receipt of this message is not intended to waive any=
applicable privilege. Please do not disseminate this message without the=
permission of the author.
***************************************************************************=
***
Any tax advice contained in this email was not intended to be used, and=
cannot be used, by you (or any other taxpayer) to avoid penalties under=
the Internal Revenue Code of 1986, as amended. =0D
Ron Roy on thu 2 oct 08
Hi Neal,
Taking Lithium out would normally raise expansion - are you sure it was not
shivering with the 3% lithium?
RR
>
>The original 1215H variation calls for 3 percent
>lithium carbonate. Using just 2 percent solved the
>crazing problem I was having with the original
>20x5 glaze.
>Neal O'Briant
Ron Roy
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Neal on fri 3 oct 08
> Taking Lithium out would normally raise expansion - are you
> sure it was not shivering with the 3% lithium?
I never made the recipe with 3% lithium. My first test was
the straight 20x5, which crazed on my clay. My change, when
trying the 1215H to remedy the crazing, was reducing the
3% lithium to 2%. That was enough lithium, plus the other
changes, to solve the crazing problem on my clay. It adds
up to 99 instead of 100.
Here is the original recipe from the Digital Fire website:
"Our 1215H introduces Li2O at the expense of high expansion
Na2O and K2O and looks like this: Wolly 17, Frit 3134 18,
EPK 21, Silica 24, Custer Feldspar 17, Lithium Carbonate 3.
This change, although modest, reduces the thermal expansion
considerably."
http://tinyurl.com/3s7wb8
Neal O'Briant
Raleigh, N.C.
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