Jeff & Melanie Boock on wed 9 feb 00
Hello,
I am using a new Raku mix (well, new to me) and the clay body
contains a ton of quartz, and the quartz is turning black during the
reduction phase of firing, which makes little black dots show up
through my white crackle glaze, 80gb 20 custer feldspar.
I was wondering if I was to put a thin porcelain slip on the pots
during the leather hard phase, if it would be durable fired to raku
temperatures, and if there were any recommended slip formulas for
something like this.
Thanks in advance!
Jeff Boock
jeff@boock.com
ababy sharon on thu 10 feb 00
The Raku claybody that I use: I tried also as a slip to cover a piece as
well as trailing slip and it passed it peacefully. For using as a slip , on
the greenware I added defocculents.This recipe is based on a recipe of V.C.
He offers two kinds of kaolin I use what I have.
VC Raku Porcelain Body ^04
==========================
ENGLISH KAOLIN(Puraf ... 40.00 39.22%
BALL CLAY....................... 20.00 19.61%
ALUMINA HYDRATE....... 12.00 11.76%
molochite............................... 10.00 9.80%
BENTOLITE ....................... 2.00 1.96%
TALC.................................... 18.00 17.65%
========
102.00
CaO 0.01* 0.06%
MgO 0.92* 8.08%
K2O 0.08* 1.63%
TiO2 0.00 0.08%
Al2O3 1.62 36.21%
SiO2 4.04 53.20%
Fe2O3 0.02 0.73%
Si:Al 2.49
SiB:Al 2.49
Expan 5.01
Good luck
Ababi
----- Original Message -----
From: Jeff & Melanie Boock
To:
Sent: Wednesday, February 09, 2000 09:14
Subject: Porcelain Slip on Raku
> ----------------------------Original message----------------------------
> Hello,
>
> I am using a new Raku mix (well, new to me) and the clay body
> contains a ton of quartz, and the quartz is turning black during the
> reduction phase of firing, which makes little black dots show up
> through my white crackle glaze, 80gb 20 custer feldspar.
>
> I was wondering if I was to put a thin porcelain slip on the pots
> during the leather hard phase, if it would be durable fired to raku
> temperatures, and if there were any recommended slip formulas for
> something like this.
>
> Thanks in advance!
>
> Jeff Boock
> jeff@boock.com
>
>
Wendy Hampton on thu 10 feb 00
Hi Jeff,
I use a thick porcelain slip on Pieppenburg Raku clay and Raku it. I used
just a porcelain clay mixed with water to make a thick slurry. I use it for
texture. I have about a 30% cracking rate doing this but I really like the
results so continue to do it.
Wendy from Poulsbo WA
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