Reg Wearley on fri 29 oct 99
We use a brown clay which fires buff and
have been trying to formulate a cocoa brown
satin matt glaze which will break here and
there to add interest. I give up-does any
one have one to share or tell me how to get
a tan glaze to brown-up a bit?
Thanks in advance---Reg
=====
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Paul Lewing on sat 30 oct 99
Reg,
Iron tends to make kind of a yellow brown in most oxidation glazes, so
add a little tin oxide with the iron. I've been working up a lovely
mottled, speckled cocoa brown glaze recently that's mostly a local slip
(mine is from Glacial Lake Missoula in Western Montana) with some
Gerstley Borate and frit, and about 5% iron oxide and 3% tin. If you
don't have any suitable local clays, try Barnard, Albany (if you're
lucky enough to have some) or maybe Alberta or Ravenscrag slip.
Good luck,
Paul Lewing, Seattle
Nancy Guido on sun 31 oct 99
I tested this glaze recipe from Ceramics Monthly, I can't remember which
issue probably 1998 or 1997, but it was a nice, rich, satin matt brown.
Gerstley Borate 2
Whiting 29
Neph Sy 58
Ball Clay 11
Zinc Ox 6
Red iron ox 10.5
I use mostly white clay and also brown clay. So I am not sure if this will
break like you want on a buff clay. But, it really was a nice bean pot brown
as I recall.
Dave Finkelnburg on sun 31 oct 99
Hi Reg,
I second Paul Lewing's comments on the use of iron. I use iron but have
found that alone it gives a pretty uninteresting brown. You might try some
MnO2, if you don't mind messing with it. It also gives browns at C5
oxidation. I wonder where Paul is getting his slip?????
Never did make it up your way yet. Hope to yet this fall.
Good potting!
Dave Finkelnburg
-----Original Message-----
From: Reg Wearley
To: CLAYART@LSV.UKY.EDU
Date: Friday, October 29, 1999 5:42 PM
Subject: Needed-^6 ox satin matt brown glaze
----------------------------Original message----------------------------
We use a brown clay which fires buff and
have been trying to formulate a cocoa brown
satin matt glaze which will break here and
there to add interest. I give up-does any
one have one to share or tell me how to get
a tan glaze to brown-up a bit?
Thanks in advance---Reg
=====
__________________________________________________
Do You Yahoo!?
Bid and sell for free at http://auctions.yahoo.com
Paul Lewing on mon 1 nov 99
Dave Finkelnburg wrote:
>
> ----------------------------Original message----------------------------
> Hi Reg,
> I second Paul Lewing's comments on the use of iron. I use iron but have
> found that alone it gives a pretty uninteresting brown. You might try some
> MnO2, if you don't mind messing with it. It also gives browns at C5
> oxidation. I wonder where Paul is getting his slip?????
Dave, I meant to mention using manganese for browns, too, but forgot. I
used to use my Raspberry Base (which is in the archives somewhere) with
about 3% MnO2 to get a medium matte cocoa brown.
As to where I'm getting that slip. There are huge deposits of it all
over western Montana in the Clark Fork and Flathead valleys. My
favorite, for purity and accessability, is a huge roadcut on I-90 right
by the Ninemile Road exit, about 25 miles west of Missoula. The clay
bank there is at least 100 yards long and 75 feet high.
Paul Lewing, Seattle
Reg Wearley on wed 3 nov 99
Thanks for the info Paul. When you said you were
using native clay as a slip I was sure that you were
using the clay layer that is pretty common in the
Puget Sound area. We lived in Gold Bar for a number
of years and had fun with the low fire native clay
all around there. So, I was surprised to hear that
you use the stuff right in my back yard! We have the
same stuff all around the Polson area. Thanks again
and I will get right with this thing. And good to
hear from you Dave. --Reg
--- Paul Lewing wrote:
> ----------------------------Original
> message----------------------------
> Dave Finkelnburg wrote:
> >
> > ----------------------------Original
> message----------------------------
> > Hi Reg,
> > I second Paul Lewing's comments on the use of
> iron. I use iron but have
> > found that alone it gives a pretty uninteresting
> brown. You might try some
> > MnO2, if you don't mind messing with it. It also
> gives browns at C5
> > oxidation. I wonder where Paul is getting his
> slip?????
>
> Dave, I meant to mention using manganese for browns,
> too, but forgot. I
> used to use my Raspberry Base (which is in the
> archives somewhere) with
> about 3% MnO2 to get a medium matte cocoa brown.
> As to where I'm getting that slip. There are huge
> deposits of it all
> over western Montana in the Clark Fork and Flathead
> valleys. My
> favorite, for purity and accessability, is a huge
> roadcut on I-90 right
> by the Ninemile Road exit, about 25 miles west of
> Missoula. The clay
> bank there is at least 100 yards long and 75 feet
> high.
> Paul Lewing, Seattle
>
=====
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ababy sharon on thu 4 nov 99
Hi!
This glaze called Waxy white.Actually it is "clear"I mean, gets the color of
the clay.will be nice on tan clay
Waxy White
==========
WOLLASTONITE........ 37.20 37.20%
QUARTZ.............. 23.50 23.50%
ENGLISH KAOLIN...... 14.90 14.90%
NEPHELINE SYENITE... 14.50 14.50%
GERSTLEY BORATE..... 9.90 9.90%
========
100.00
CaO 0.87* 21.12%
MgO 0.02* 0.43%
K2O 0.02* 1.01%
Na2O 0.08* 2.20%
TiO2 0.00 0.01%
Al2O3 0.22 9.55%
B2O3 0.10 3.03%
SiO2 2.40 62.47%
Fe2O3 0.00 0.17%
Cost/kg 8.64
Si:Al 11.10
SiB:Al 11.56
Expan 7.23
Notes:
from Deirdre Slaven@Colorado.EDU
Very nice!
" For green add2% copper car."
I think that every colorant that will be added in small amounts will be
nice.Only on light clay.
Of cours I write english kaolin because that is the one I have not
neseseraly what SHOULD be
Ababi
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