Richard Harris on sun 11 jan 98
> This all seems simple to me now - is it just because I have been doing it
> so long? Whenever I post this kind of stuff the silence is deafening - is
> there anyone out there - are my expanations too compicated - It would be
> nice to at least get an occasional question - just so I'll know I'm still
> alive.
>
Okay, Ron, I'll bite, :)
I have siome questions (or sortof questions/observations/wondering about
things)
They concern the holy grail-like quest of a ^6 clear that doesn't craze
on porcelain.
I am using Plainsman P300, a midfire porcelain, fired to 2185F, with
navy slipdecoration and using the glaze recipe:
Frit 3134 50
Kaolin 30
Flint 20
bentonite 1 or 2 %
This crazes, so i adjusted it to even out the flint and kaolin both to
25%, i had even tried raising silica to 30%, but it started to get
clouded, and looked too thin on the pot (but didn't craze).
So, now this doesnt seem to be crazing much, BUT, i have done only
smaller things with it, such as up to about 7 inches diameter. (And i
haven't quite worked up the nerve to do the hot/cold thing with them)
I have noticed that previously, small things might not craze, but larger
pieces the glaze DID develop craze lines.
ALSO, i had noticed that the type of kaolin makes a noticeable
difference: using EPK resulted in instant crazing, fine lines in an
even pattern, Pioneer kaolin resulted in delayed crazing, in a large,
irregular mess.
So, what i am asking is:
1. why does the type of kaolin make a difference?
2. would calcining part of the kaolin make a difference?
3. Is there something else i can try, other than playing with the
proportions of these 3 ingredients?
other random observations: the areas where blue slip is, rarely, if ever
crazes. please don't suggest changing clays. i have tested and
line-blended about 10 other clear recipes, and this is still my
favorite, based on color response, texture, and how it prevents the slip
decoration from "moving", why are all these glazes so prone to
scratches? I tried looking at a glaze program and started a panic
attack. i lowered the temp from ^6-2199 to 2185, because it seems even
those few degrees made a better looking surface, since i was getting
some bumpiness on the navy slip at the higher temp.
So, please help me out here, Ron. I do read all your (and Tom Buck's)
posts re glazes, (at least those at ^6) and have always trusted that you
know what you're talking about
Thanks!!!
Michelle Harris
heorot@sk.sympatico.ca
Laura Conley on tue 13 jan 98
To Ron Roy and Clayart,
It is my NAIVE understanding that the coefficient of expansion is imortant in
determining glaze fit and crazing. With this knowledge, I would expect that
one would try varying amounts of different fluxes, with different coefficients
of expansion, when trying to eliminate crazing. Is this true? Is it only a
small part of the big picture??? What other aspects of the glaze formula are
important?
Thank you for the glaze lesson, in advance,
Laura Conley
Boulder, CO
Richard Harris wrote:
> ----------------------------Original message----------------------------
> > This all seems simple to me now - is it just because I have been doing it
> > so long? Whenever I post this kind of stuff the silence is deafening - is
> > there anyone out there - are my expanations too compicated - It would be
> > nice to at least get an occasional question - just so I'll know I'm still
> > alive.
> >
> Okay, Ron, I'll bite, :)
> I have siome questions (or sortof questions/observations/wondering about
> things)
> They concern the holy grail-like quest of a ^6 clear that doesn't craze
> on porcelain.
> I am using Plainsman P300, a midfire porcelain, fired to 2185F, with
> navy slipdecoration and using the glaze recipe:
> Frit 3134 50
> Kaolin 30
> Flint 20
> bentonite 1 or 2 %
> This crazes, so i adjusted it to even out the flint and kaolin both to
> 25%, i had even tried raising silica to 30%, but it started to get
> clouded, and looked too thin on the pot (but didn't craze).
> So, now this doesnt seem to be crazing much, BUT, i have done only
> smaller things with it, such as up to about 7 inches diameter. (And i
> haven't quite worked up the nerve to do the hot/cold thing with them)
> I have noticed that previously, small things might not craze, but larger
> pieces the glaze DID develop craze lines.
> ALSO, i had noticed that the type of kaolin makes a noticeable
> difference: using EPK resulted in instant crazing, fine lines in an
> even pattern, Pioneer kaolin resulted in delayed crazing, in a large,
> irregular mess.
> So, what i am asking is:
> 1. why does the type of kaolin make a difference?
> 2. would calcining part of the kaolin make a difference?
> 3. Is there something else i can try, other than playing with the
> proportions of these 3 ingredients?
>
> other random observations: the areas where blue slip is, rarely, if ever
> crazes. please don't suggest changing clays. i have tested and
> line-blended about 10 other clear recipes, and this is still my
> favorite, based on color response, texture, and how it prevents the slip
> decoration from "moving", why are all these glazes so prone to
> scratches? I tried looking at a glaze program and started a panic
> attack. i lowered the temp from ^6-2199 to 2185, because it seems even
> those few degrees made a better looking surface, since i was getting
> some bumpiness on the navy slip at the higher temp.
>
> So, please help me out here, Ron. I do read all your (and Tom Buck's)
> posts re glazes, (at least those at ^6) and have always trusted that you
> know what you're talking about
> Thanks!!!
>
> Michelle Harris
> heorot@sk.sympatico.ca
Joyce Lee on wed 14 jan 98
Don't give up, Ron! How could I have missed this thread??? Even from my
relaltively low position, I have learned so much about glazes from this
list, very dependably from you. Glaze workshops are wonderful, but I'm
finding they just get you started on the right path which is where I
am...just starting with glazes. I'm intrigued, curious and amazed
that I even care about the chemical and physical properties of this
"little hobby" that was meant to mellow me into retirement, but I do. I
thought I'd be using commercial glazes solely. That didn't last long.
Now I have shelves full of chemicals BUT am still generally at the stage
of testing the thousands of recipes available. Though I want to move
beyond this stage, right now my plate is full. However, I'm absorbing
the glaze info from you and Craig and Robert and Tony (and others) and
clearing the fog from my overburdened brain. When I'm better equipped
with understanding of forms and the glazing process itself, I figure I
should have some small foundation of knowledge gained here on
Clayart (just by reading the glaze gurus' messages) upon which to build.
You gotta' be there when that happens! I'm sure there are hundreds in
the same place I am. That's where Clayart functions best and only
because of the generous sharing of the few potters in the WORLD with the
capability to both understand and to teach in CYBERSPACE, for goodness
sake. How proud you should be! Thank you.
Joyce
In the Mojave
carrie or peter jacobson on tue 8 dec 98
Ron, in response to your question about appropriateness, I would say,
Please! Please! Tell us the manufacturers for whom you test clay!
You are one of the people I trust without question on this list, and one of
the people from whom I learn. Chances are, I will not be able to get clay
from the manufacturers, as least not now, but I'd like to know who they
are, how they regulate their product, what you do to test, anything.
And thank you again for the analysis, help, and gentle responses you give,
over and over, generously.
Carrie
Carrie Jacobson
Pawcatuck, CT
mailto:jacobson@brainiac.com
Ron Roy on thu 10 dec 98
Thanks for this Carrie,
Bailey's carries Tuckers clay - give them a call and ask for a catalogue.
RR
>----------------------------Original message----------------------------
>Ron, in response to your question about appropriateness, I would say,
>Please! Please! Tell us the manufacturers for whom you test clay!
>
>You are one of the people I trust without question on this list, and one of
>the people from whom I learn. Chances are, I will not be able to get clay
>from the manufacturers, as least not now, but I'd like to know who they
>are, how they regulate their product, what you do to test, anything.
>
>And thank you again for the analysis, help, and gentle responses you give,
>over and over, generously.
>
>Carrie
>
>
>Carrie Jacobson
>Pawcatuck, CT
>mailto:jacobson@brainiac.com
Ron Roy
93 Pegasus Trail
Scarborough, Ontario
Canada M1G 3N8
Tel: 416-439-2621
Fax: 416-438-7849
Web page: http://digitalfire.com/education/people/ronroy.htm
Jennifer on tue 22 dec 98
As a newbie, I have a few questions about Ron Roy that maybe some of you
can answer for me...
Does he have a degree?? If so where from, and in what??
How long has he been doing this??
I find his answers very thorough, but sometimes over my head. So I
appreciate when everyone answers the same question so I get a
well-rounded, comprehensible answer.
Thanks--
Jennifer
Jennifer on wed 23 dec 98
I think maybe my question was misinterpreted. I wondered about his
qualifications, not because I doubt them, but because it would be an
aspect of ceramics that I would be interested in pursuing, as I have
just completed my BFA and am interested in continuing my education so I
can better my chances of finding a ceramic-related job.
Likewise, I am interested in all how all Clayarters started in the business.
Sorry for the confusion in my question, next time I'll try to clarify.
Jennifer
Liz Willoughby on fri 25 dec 98
Hello Jennifer,
Glad you clarified your question. Been thinking how or if I should respond
for Ron, but decided to bite the bullet.
Ron graduated from the Ontario College of Art in the 60's. He made large
pots, and architectural commissions then for walls. Later he went in the
clay business, because potters everywhere in Ontario needed good access to
clay. Then he sold his business, started making pots again, and became a
clay consultant for Tuckers. He is keenly interested in the science of
glazes, and clay, and over all these years has researched glazes and clay
with curiosity and thoroughness.
I should add, that with Ron, his first priority has been to help the clay
community in whichever way he can, which is so obvious from his posts to
clayart.
I'm not really sure that "academic qualifications", are the answer in
pursuing a ceramic-related job, but 30 years of experience, curiosity, and
research is.
Good luck in your pursuit of knowledge.
Liz
>----------------------------Original message----------------------------
>I think maybe my question was misinterpreted. I wondered about his
>qualifications, not because I doubt them, but because it would be an
>aspect of ceramics that I would be interested in pursuing, as I have
>just completed my BFA and am interested in continuing my education so I
>can better my chances of finding a ceramic-related job.
>
>Likewise, I am interested in all how all Clayarters started in the business.
>
>Sorry for the confusion in my question, next time I'll try to clarify.
>
>Jennifer
Liz Willoughby
2903 Shelter Valley Rd.
R.R.#1
Grafton, Ontario
Canada. K0K 2G0
e-mail lizwill@phc.igs.ca
Ron Roy on fri 25 dec 98
Hi Jennifer,
I am a high school graduate - barely got through - and 3 years of Art
College - in which there was hardly any technical information.
It is safe to say I am self taught with a lot of help from my friends.
I've been in clay for 40 years now as a studio potter, part time teacher
and even had my own clay supply business for 10 years.
I am sure there will be many suggestions on where to start - being curious
will help a lot - and having and using 5 or 6 key books will get you off
the ground - and of course keep a good grip on ClayArt - the best reference
of all.
RR
>----------------------------Original message----------------------------
>I think maybe my question was misinterpreted. I wondered about his
>qualifications, not because I doubt them, but because it would be an
>aspect of ceramics that I would be interested in pursuing, as I have
>just completed my BFA and am interested in continuing my education so I
>can better my chances of finding a ceramic-related job.
>
>Likewise, I am interested in all how all Clayarters started in the business.
>
>Sorry for the confusion in my question, next time I'll try to clarify.
>
>Jennifer
Ron Roy
93 Pegasus Trail
Scarborough, Ontario
Canada M1G 3N8
Tel: 416-439-2621
Fax: 416-438-7849
Web page: http://digitalfire.com/education/people/ronroy.htm
Carolyn on thu 14 sep 00
Hi, Clayarters,,
Ron Roy is giving a workshop for the Carolina Clay
Guild tomorrow 15th, 16th and 17th at Rockingham
Community College.. in Wentworth, NC just outside of
Greensboro, NC.. Just wondering who from the list is
coming .. I would like to meet anyone who might be
there.. I'll put my name badge on, providing we have
one .. and will be looking forward to meeting you.. by
the way, can't wait to meet you Ron., if you see this
message tonite.. Regards, Carolyn in the soon to be,
put on your longjohns, well maybe a sweater, Carolinas...
L. P. Skeen on fri 15 sep 00
Well, after a rather hairy trip down here, Ron finally arrived about 1:30
this morning - Only 3 hours late, thanks to a whopper of a storm system that
stuck over Greensboro airport for 3 hours. What with the hour it took to
get him to the B&B, and then 40 minutes or so back to my house, I think
maybe Ron got a half hour more than the 4 hours of sleep _I_ got.....
Anyway, the workshop is going well despite lack of sleep, and if you get a
chance to take a RR workshop, get signed up quick!
----- Original Message -----
From: Carolyn
To:
Sent: Thursday, September 14, 2000 8:24 PM
Subject: Ron Roy
> Hi, Clayarters,,
> Ron Roy is giving a workshop for the Carolina Clay
> Guild tomorrow 15th, 16th and 17th at Rockingham
> Community College.. in Wentworth, NC just outside of
> Greensboro, NC.. Just wondering who from the list is
> coming .. I would like to meet anyone who might be
> there.. I'll put my name badge on, providing we have
> one .. and will be looking forward to meeting you.. by
> the way, can't wait to meet you Ron., if you see this
> message tonite.. Regards, Carolyn in the soon to be,
> put on your longjohns, well maybe a sweater, Carolinas...
>
>
____________________________________________________________________________
__
> 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.
>
Liz Willoughby on tue 15 jan 02
Ron has asked me to let the list know that he is having server
problems, and has not been able to receive any clayart messages.
Evidently the problem is being fixed, but he doesn't know how long it
will take, so he will answer any questions as soon as he can, notably
about clay testing.
Best regards, Liz
Liz Willoughby
RR 1
2903 Shelter Valley Rd.
Grafton, On.
Canada
K0K 2G0
e-mail lizwill@phc.igs.net
mel jacobson on tue 26 nov 02
please contact nils lou.
he has adult questions.
nlou@calvin.linfield.edu
mel
From:
Minnetonka, Minnesota, U.S.A.
web site: my.pclink.com/~melpots
or try: http://www.pclink.com/melpots
Ellie Blair on sun 24 aug 03
Hi Ron,
Could you email off list. With all the virus problems I deleted your add=
ress as you requested. I wanted to talk to you about the formulas you di=
d for me before all the stuff hit our computers. I am ready to start the=
tests but have a couple of questions.
Thanks
Ellie Blair
Blair Pottery
Lawrence, Kansas 66047
blairea53@msn.com
joyce on fri 16 nov 07
Until Ron gets his computer problem squared with ACers ....... tell
him please that he can send his posts to me and I'll send them in
on my account.
Thank you.
Joyce
In the Mojave
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