Ann Testa on wed 1 jun 11
I am looking for a clear crackle glaze for raku that takes color well &
actually crackles. I have tried several & am not getting the crackle I wo=
uld
like to have.
Ann Testa
_www.anntesta.com_ (http://www.anntesta.com)
J.A. Monk on sat 4 jun 11
Ann, here is the Raku glaze that we used at Manatee Community College.
Clear Crackle (gram batches)
Gerstley Borate 66.7 333.5 3335 6670 13340
Nepheline Synenite 8.3 41.5 415 830 1660
OM#4 8.3 41.5 415 830 1660
EPK 16.7 83.5 835 1670 3340
100.0 500.0 5000 10000 20000
See below for addition color.
#1 White - Zircopax 16%
James
-----Original Message-----
From: Clayart [mailto:Clayart@LSV.CERAMICS.ORG] On Behalf Of Ann Testa
Sent: Wednesday, June 01, 2011 7:32 PM
To: Clayart@LSV.CERAMICS.ORG
Subject: Raku Clear Crackle
I am looking for a clear crackle glaze for raku that takes color well &
actually crackles. I have tried several & am not getting the crackle I
would
like to have.
Ann Testa
_www.anntesta.com_ (http://www.anntesta.com)
paul gerhold on sat 4 jun 11
Ann
Raku crackle is all about clay/glaze fit. About all you can do is try
different glazes till one does what you want. You can also change glaze
thickness, firing temp, rate of heating, rate of cooling, pot thickness,
etc. Pot shape matters cause it effects cooling of the glaze. If you are
glaze savvy you can make small modification to the glaze that may or may no=
t
have big effects on crackling (easiest is add or subtract silica)
Sometimes going to a lower shrinkage clay can result in better crackle.
Suggest you do a lot of reading, followed by research, with keeping good
notes.
What do you mean by taking color well? Are we talking smoke or are you
using dyes or metals oxides in a secong firing.
Paul
On Wed, Jun 1, 2011 at 8:31 PM, Ann Testa wrote:
> I am looking for a clear crackle glaze for raku that takes color well &
> actually crackles. I have tried several & am not getting the crackle I
> would
> like to have.
>
> Ann Testa
> _www.anntesta.com_ (http://www.anntesta.com)
>
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