Michael Wendt on mon 21 may 07
Sylvia,
If you are formulating the slip from
clay, feldspar and silica, you can
substitute a whiter firing clay
(like Grolleg) for the clay
portion of the slip.
Off white color is usually because
of contamination by iron or other
materials that don't fire white.
If the main clay is ball clay,
you may need to alter the amount
of silica and flux to get the same
shrinkage and porosity as the off
white clay body.
If color is your only concern,
I have added alumina to clay and
the result is spectacular.
Helmer:Alumina 50:50 is as white
as copy paper but it does not take
glazes well since it is refractory
and porous.
Regards,
Michael Wendt
Wendt Pottery
2729 Clearwater Ave
Lewiston, ID 83501
USA
208-746-3724
http://www.wendtpottery.com
wendtpot@lewiston.com
Hello everyone, new member calling.
I have been making slip from my off-white stoneware
clay body and coloring
it with high firing stains. Can anyone suggest what I
should add to the base
slip to make a good strong white? I have tried tin
oxide with limited
success. Will Titanium oxide work better? If so, how
much should I use?
Thanks in advance
Sylvia
Sylvia Holmes on wed 23 may 07
Hello everyone, new member calling.
I have been making slip from my off-white stoneware clay body and coloring
it with high firing stains. Can anyone suggest what I should add to the base
slip to make a good strong white? I have tried tin oxide with limited
success. Will Titanium oxide work better? If so, how much should I use?
Thanks in advance
Sylvia
Maid O'Mud on wed 23 may 07
Try 10% zircopax. Much cheaper than either tin or titanium
Sam Cuttell
Maid O'Mud Pottery
RR 1
Melbourne, Ontario
N0L 1T0
CANADA
"First, the clay told me what to do.
Then, I told the clay what to do.
Now, we co-operate."
sam 1994
http://www.ody.ca/~scuttell/
scuttell@ody.ca
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Sylvia Holmes
Sent: May 23, 2007 10:10 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: whiter slip
Hello everyone, new member calling.
I have been making slip from my off-white stoneware clay body and coloring
it with high firing stains. Can anyone suggest what I should add to the base
slip to make a good strong white? I have tried tin oxide with limited
success. Will Titanium oxide work better? If so, how much should I use?
Thanks in advance
Sylvia
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3:49 PM
Alex Solla on wed 23 may 07
Sylvia-
Titanium can make a nice slightly yellowish white slip. I would save my Tin
Ox for glazes
that need it; reds, and such. A cheaper and whiter solution would be to use
any of the zircon
based opacifiers... zircopax, ultropax, superpax.... any zirconium silicate.
Might take up to 10% to make it truly white depending on what your base slip
is made from.
Good luck and please let us know what you find works best for you.
-Alex Solla
Cold Springs Studio Pottery
4088 Cold Springs Road
Trumansburg, NY 14886
607-387-4042 voice/fax
www.coldspringsstudio.com
Can anyone suggest what I should add to the base
slip to make a good strong white? I have tried tin oxide with limited
success. Will Titanium oxide work better? If so, how much should I use?
Thanks in advance
Sylvia
May Luk on wed 23 may 07
Hello Sylvia;
My stoneware white slip was 50% Hyplas 71 and 50%
China Clay when I was working in the UK. I think
Titanium and Tin would turn your color slip more
pastel-like if you are looking for bright color slips.
Although it makes sense to use body clay as the slip.
I used to have good results with just Hyplas 71 as my
only slip ingredient on all kinds of bodies.
Regards
May
MacIntire, Matt on wed 23 may 07
Sylvia,
If you want to whiten up your slip, I'd recommend you use Zircopax
instead of Tin. Neither are cheap, but Zircopax is considerably cheaper
than Tin Oxide. Whatever white opacifier you use, you'll probably need
quite a bit, maybe 10% (or more?) to get clean whites.
If it were me, rather than trying to whiten up an off-white slip made
from your clay, I'd just mix up a white slip with ingredients that were
whiter to start with. Recipes are all over the place for white slips.
I've had good luck with the formulas in Rhodes' book.
Good luck!
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Sylvia
Holmes
Subject: whiter slip
Can anyone suggest what I should add to the base slip to make a good
strong white?=20
Fred Parker on wed 23 may 07
Hi Sylvia:
Have you considered finding a whiter stoneware to use? I have had very
good results using Laguna's "B" mix, although I prefer a white that is
just a touch away from milk truck white. I apply it at leather hard, and
have never had a problem with it.
Fred
On Wed, 23 May 2007 09:10:13 -0500, Sylvia Holmes
wrote:
>Hello everyone, new member calling.
>I have been making slip from my off-white stoneware clay body and coloring
>it with high firing stains. Can anyone suggest what I should add to the
base
>slip to make a good strong white? I have tried tin oxide with limited
>success. Will Titanium oxide work better? If so, how much should I use?
>Thanks in advance
>Sylvia
>
>__________________________________________________________________________
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melpots@pclink.com.
Richard Aerni on wed 23 may 07
If you just let a bag of porcelain, or your porcelain trimming scraps, or
your whiteware trimming scraps slake in water, and then blunge, you'll have
as white a slip as you'll ever want, without having to spend the money on
tin, titanium, or zircopax plus.
Best,
Richard Aerni
Rochester, NY
Lee Love on thu 24 may 07
Back home, I used Continental Clay Superwhite, a white stoneware as my
white slip.
Here, I use a mix of Korean Kaolin, Amakusa porcelain stone and a
couple ball clays.
--
Lee in Mashiko, Japan
Minneapolis, Minnesota USA
http://mashikopots.blogspot.com/
"To affect the quality of the day, that is the highest of arts." -
Henry David Thoreau
"Let the beauty we love be what we do." - Rumi
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