Galen Kirkwood on thu 7 jan 99
------------------
Hi again,
I'm having problems with a matt glaze. I'm new to firing in general, and I
bought some pre mixed =5E10 dry glazes from
Clayart in Tacoma. I tested the glazes on a bunch of tiles and all went =
well. I
decided to do some tests on 20 mugs I
wasn't attached to. I tested 3 shiney and 2 matt glazes in various =
combinations.
The blue matt glaze pulled away where
ever it was under another glaze. It also crawled in a fairly even line up =
the
mug from the base where ever it was by
itself.. Also a few very small bare spots exposing the clay body. Where ever=
the
glaze was only applied over another
glaze it was fine. It came out quite =22matty=22 so I don't think I cooled =
down to
fast. The other matt glaze I used, a tan,
had a few tiny bare spots,(2 out of 5 mugs) but nothing like the blue, and =
it
blended well with the other glazes. The
rest of the glazes and combos fired out fine, cone =5E10, 13.5 hours. I =
sponged
the mugs before glazing, so I'm thinking
it's the glaze. Any Ideas what it might be? I used the same water to drymix =
in
all the glazes, and it doesn't seem to
thin or thick, though my sense of this may not be very developed. I know, I =
need
to take a basic glaze class and move
toward mixing my own glazes, but when I think about it, it reminds me of =
what
Gerald Ford said when asked to review the
federal budget for the first time: =22 I was led to believe that there would=
be no
math involved=21=22 Anyways, thanks for any
pointers and thanks to the group for being here, especially untill I can get
into a few workshops this summer.
My brain is full,
Galen
Harry Verkooyen on fri 8 jan 99
I dealt with ClayArts in Tacoma for five years and they were the best guys
in the world. Blue glazes do crawl and they have to be treated just so or
ELSE. Anyway the Clay arts guys have a toll free line and are more than
happy to help whenever needed. They did tell me to bisque higher, let the
glaze dry completely before firing and soak at 1000 degrees for about an
hour. Everything worked much better then. I had the prettest blue glazes
and I used the Midnight Blue underneath and the Royal Blue on the top which
created the nicest feathery breakthroughs.
Damn I wish I had some of those blue glazes now!!
Michelle
-----Oorspronkelijk bericht-----
Van: Galen Kirkwood
Aan: CLAYART@LSV.UKY.EDU
Datum: vrijdag 8 januari 1999 1:20
Onderwerp: Crawling matt glaze
----------------------------Original message----------------------------
------------------
Hi again,
I'm having problems with a matt glaze. I'm new to firing in general, and I
bought some pre mixed ^10 dry glazes from
Clayart in Tacoma. I tested the glazes on a bunch of tiles and all went
well. I
decided to do some tests on 20 mugs I
wasn't attached to. I tested 3 shiney and 2 matt glazes in various
combinations.
The blue matt glaze pulled away where
ever it was under another glaze. It also crawled in a fairly even line up
the
mug from the base where ever it was by
itself.. Also a few very small bare spots exposing the clay body. Where ever
the
glaze was only applied over another
glaze it was fine. It came out quite "matty" so I don't think I cooled down
to
fast. The other matt glaze I used, a tan,
had a few tiny bare spots,(2 out of 5 mugs) but nothing like the blue, and
it
blended well with the other glazes. The
rest of the glazes and combos fired out fine, cone ^10, 13.5 hours. I
sponged
the mugs before glazing, so I'm thinking
it's the glaze. Any Ideas what it might be? I used the same water to drymix
in
all the glazes, and it doesn't seem to
thin or thick, though my sense of this may not be very developed. I know, I
need
to take a basic glaze class and move
toward mixing my own glazes, but when I think about it, it reminds me of
what
Gerald Ford said when asked to review the
federal budget for the first time: " I was led to believe that there would
be no
math involved!" Anyways, thanks for any
pointers and thanks to the group for being here, especially untill I can get
into a few workshops this summer.
My brain is full,
Galen
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