bill edwards on thu 26 may 05
Steve, your trying hard as the rest based on your own
statement, thats good! Lee made a great attempt to
correctly answer the question as asked, and I pulled
the statement up to clear any misunderstanding myself
and Earl apparently was adept at looking over the
archived question too! We all try too hard and I
applaud that and now that should be corrected and on
to the next ramble.
If the person is seeing pin-holing prior to the firing
that person has another issue besides the firing going
on. Based on the statement we are wadding past the
origin of the problem. What might be causing the
pin-holing, the clay, the glaze or a low bisque firing
or all combined?
Lets see what our commercial clay producers have to
say on this? Do they provide the technical information
as to a suggested bisque range for their specific ^
bodies of clay? Lets hear from them. I am certain they
would know this. Long/Slow firing in bisque is my
personal suggestion and ^04 instead of ^06. Then if
there's a problem there's room to look at the glaze
then. I also would suggest taking each bisque piece
and plunging it in some water once its cooled and
cleaning it and setting it out in a clean non-dusty
area for a 24 hour period prior to glazing. (some just
wash with a sponge and clean water) Any dust residue
on a piece of bisque will come back to haunt you and
sometimes you cannot see it. I don't know which glaze
it would be that was in Ron or John's book and that
wasn't made public, but I sincerely doubt the problem
lies within the glaze knowing these guys, I will just
put a (?) in there at this point. Sometimes we also
get some bad materials from our suppliers that may
contain a contaminate. There's a slew of things that
might be happening so we can argue all day and not fix
anything until we settle on the science that Steve
mentioned in one of those posts somewhere in the
bowels of the archives or among the others that go way
back in time on this same question.
Bill Edwards
Edmar Studio and Gallery
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Tom at Hutchtel on fri 27 may 05
OK Bill...Good questions and the answers (or theories) will be interesting.
But how come you can take a glaze that pinholes on one body, put it on
another, and voila! Or put it on porcelain and absolutely no pinholes.
So there must also be some aspect of the clay/glaze interface that affects
certain glazes. (As Ron R rolls his eyes and says "not again"). I think
I've noted that glazes that are short of silica will tend to pinhole on
stoneware's (cone 10) at least that's our experience...the glazes we have
problems with are mostly short of silica.
So one exercise would be to compare the recipes of those glazes people are
having trouble with and see if there are any commonalities.
Tom Wirt
Louis Katz on fri 27 may 05
I think some knowlege from the glass makers would help in our
understanding of pinholes.
I think that there is something messing with the solubility of gas in
our glazes. I came to this idea while thinking about when floating blue
sinks. I think when TiO2 goes into solution, (perhpas its iron that
goes into solution late in the melting) it decreases the solubility of
some gas in the glaze and forces it out as pinholes. I wish I could
tell you where this idea came from, but it is just conjecture. I have
little to back it up. I think something similar is happening here with
your clay body.
Louis
http://www.tamucc.edu/~lkatz
http://falcon.tamucc.edu/wiki/Katz/HomePage
http://www.qsl.net/ke5cvk/
Jim Willett on sat 28 may 05
Re:Out of the Fire.....Gee guys...could we rename this?..every time we see
it we get all excited thinking someone is talking about us! Jim and
Cindy...Out of the Fire Studio, Edmonton, Alberta, Canada
http://www.outofthefirestudio.com
Joseph Herbert on sun 15 jul 07
In practice copyrights and trademarks are only good to the extent that the
owner is willing to "protect" them. Some (many) large companies spend lots
of money suing persons or entities who have, it is claimed, infringed the
right of whomever. Often these defenses can seem strange and nitpicky.
Sometimes a giant pursues a mouse (for millions of dollars) over the use of
a single word. Big corporations have legal departments and one of their
jobs is just that very thing - find examples of misuse of a protected thing
and then go after the miscreants. Most of us cannot spend the time or
effort, so the undefended idea is co-opted and becomes public, or may be
taken by someone who can, and will, defend it. There have been cases in the
music business where an individual successfully sued - reference George
Harrison.
Could William Blake have sued Jim Morrison? Could the Doors have sued
Pella, or vis versa?
"Outing the Friar" was a story that did not make it through the final
editorial meeting for "Canterbury Tales". "Out of the Fryer" is an upcoming
expose` of the life on a Fast-Food chain cooking line. "Out of the Foyer",
tales of a New York Doorman. "Out of the Fire" a harrowing tale of a week
in the life of a smoke jumper.
There is a Joseph J. Herbert who is a doctor in Miami. If he is younger
than I am, perhaps I could sue his parents. Somehow his success must have
diminished mine.
Joe
Joseph Herbert
Technical Writer
Irving, Texas
214-725-8305 (Cell)
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