=?iso-8859-1?q?Iben=20Vedel?= on fri 12 mar 04
Hello all.
My teacher recently made a new Turquise/oxblood glaze by mixing to other of his glazes. He made a small test, it was fine.I glazed a few pieces with his first small batch, they were fine.
I then decided to make a big batch for all of os at school to use.
It has crawled on all almost all the pieces I glazed, especialy the larger pieces.
I have a feeling that I have made a mistake when making the glaze and have talked to my teacher about it. With his advice and what I have read about crawling and surface tension in Hamer & Hamer, it seems that there is not much to do, because the things I might try to add will make the glaze to runny.
Now I was wondering if any of you have had this problem and what you have done about it.
Best Regards from
Iben Vedel
*Brussels_where the Pots do their fire dance and the glazes run Wild* ivedel@yahoo.com
---------------------------------
Yahoo! Messenger - Communicate instantly..."Ping" your friends today! Download Messenger Now
John Britt on fri 12 mar 04
Iben,
I have had this problem with copper reds that have natural borates, like
Gerstley borate or borax in them, as opposed to boron frits. This is
because in the early stages of the firing (600 - 1100 F) the chemical
water in the borates is leaving the glaze and if you go too fast it will
cause the glaze to release from the pot, resulting in crawling.
Don't know your recipe so it may or may not apply,
John Britt
Ivor and Olive Lewis on sat 13 mar 04
Dear Iben Vedel,
You leave us in the dark. More information is needed to answer this
sort of question.
Not only would we need to have the recipes of the two original glazes
but something about your firing schedules is essential when asking
this sort of question.
At one time I would have said there were stormy waters ahead when two
glazes were mixed but with the advent of the system devised by Ian
Currie that caveat is out of the window.
In fact, Using Ian's System may be the best way to solve your dilemma.
Means a little bit of systematic work but the results should define a
solution to meet your needs.
Best regards,
Ivor Lewis. Redhill, South Australia
----- Original Message -----
From: "Iben Vedel"
To:
Sent: Saturday, 13 March 2004 12:44
Subject: To the glaze experts, problem with crawling glaze.
> Hello all.
> My teacher recently made a new Turquise/oxblood glaze by mixing to
other of his glazes. He made a small test, it was fine.I glazed a few
pieces with his first small batch, they were fine.
> I then decided to make a big batch for all of os at school to use.
> It has crawled on all almost all the pieces I glazed, especialy the
larger pieces.
> I have a feeling that I have made a mistake when making the glaze
and have talked to my teacher about it. With his advice and what I
have read about crawling and surface tension in Hamer & Hamer, it
seems that there is not much to do, because the things I might try to
add will make the glaze to runny.
> Now I was wondering if any of you have had this problem and what you
have done about it.
> Best Regards from
> Iben Vedel
>
>
>
> *Brussels_where the Pots do their fire dance and the glazes run
Wild* ivedel@yahoo.com
>
>
>
>
>
> ---------------------------------
> Yahoo! Messenger - Communicate instantly..."Ping" your friends
today! Download Messenger Now
>
>
______________________________________________________________________
________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your
subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
| |
|
