hal mc whinnie on sat 5 dec 98
i am certainly encouraged about the very positive response to the online
glaze course.
I will enroll all who send me an email and in about two weeks shall send
a course outline and a test to see if people can access the attached
files.
the glaze course will be sent as attacted files to tthe glaze of the week
so if you are either in the special course or on the glaze of the week
you shall get both for this first class
the course will be repeadted several times this year, the second course
will be gin in arpil and for that class there will be a special listing
needed and the lessons will not be associated with the glaze of the week
which shall continue all year.
later in the year I will plan on an advanced course.
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hal mc whinnie on mon 7 dec 98
i hope all will be a bit patient with any delays in response but my mail
box is overflowing with request to join claze course.
i will send a course outline in about a week and shall be sending one our
two test usbmisssions to see if i have your email addresses correct.
if you dont hear in two weeks send me another request.
hal
have a good holiday and best wished for the new year to all on clayart
___________________________________________________________________
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hal mc whinnie on tue 20 jun 00
I have a ten lesson glaze course which I have given several times on the
internet. If members of clay art would be interested ZI can post a lesson
per week in two parts.
please rspond
hal mc whinnie
Larry Vaughn on tue 20 jun 00
yes, I would be interested. Joanna Vaughn
----- Original Message -----
From: "hal mc whinnie"
To:
Sent: Tuesday, June 20, 2000 3:21 AM
Subject: glaze course
> I have a ten lesson glaze course which I have given several times on the
> internet. If members of clay art would be interested ZI can post a lesson
> per week in two parts.
> please rspond
> hal mc whinnie
>
>
____________________________________________________________________________
__
> 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.
WHew536674@CS.COM on tue 20 jun 00
I think that is a neat idea. I am sure a lot of us could use a refresher,
and if we don't want it we all know where the delete button is. Go for it
Joyce A.
Nalis Giles on tue 20 jun 00
PLEASE!!! PLEASE!!!! PLEASE!!!!
I really need help in the glaze department. If no one else wants to know you
can send to my e-mail to not clutter up the board. Thanks for any info.
nalis
Bruce Gioia on wed 21 jun 00
Please Hal tell me more
about your glaze course.
Thanks
Bruce
----- Original Message -----
From: hal mc whinnie
To:
Sent: Tuesday, June 20, 2000 1:51 PM
Subject: glaze course
> I have a ten lesson glaze course which I have given several times on the
> internet. If members of clay art would be interested ZI can post a lesson
> per week in two parts.
> please rspond
> hal mc whinnie
>
>
____________________________________________________________________________
__
> 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.
>
sibylle on wed 21 jun 00
Hi Hal,
I would be interested very much.
Sibylle
(germany)
Gerry Chichester on wed 21 jun 00
Hal - I, for one, would be really interested in your on-line glaze =
course. While not totally isolated from any "hands-on" expert help, I =
am a good 60 miles at least from any pro-potters and feel quite alone at =
times. Thanks in advance - Carly in Coleville
Patrice Murtha on wed 21 jun 00
I too would be interested in this course.
>I have a ten lesson glaze course which I have given several times on the
>internet. If members of clay art would be interested ZI can post a lesson
>per week in two parts.
>please rspond
>hal mc whinnie
>
>______________________________________________________________________________
>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.
Laura Freedman on wed 21 jun 00
>Sounds good.Am interested. Thanks. Laura
>I have a ten lesson glaze course which I have given several times on the
>internet. If members of clay art would be interested ZI can post a lesson
>per week in two parts.
>please rspond
>hal mc whinnie
>
>______________________________________________________________________________
>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.
Lynne at The Pottery Web on wed 21 jun 00
That sounds fantastic!!!!!!!!!
Lynne in Atlanta
>______________________________________________________________________________
>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.
Mo Cain on wed 21 jun 00
Hal. Include me too please.
mocain
vescolar on wed 21 jun 00
Hal,Yes, I am very interested in your internet glaze course.
thanks Vivi
>
Marvpots@AOL.COM on wed 21 jun 00
Re: Hal McWinney glaze course:
Sounds interesting to me; I hope you get enough encouragement to post your
lessons.
Thanks.
Marvin Flowerman
marvpots@aol.com
Monique Duclos on wed 21 jun 00
I can use all the help anyone can give me! It would be greatly appreciate!
@micalement
Monique
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Chris & Tom Troy on wed 21 jun 00
Yes please.
Chris Troy in the Upstate of S.C. where the afternoon thunder boomers aren't
doing much to help the draught.
-----Original Message-----
From: hal mc whinnie
To: CLAYART@LSV.CERAMICS.ORG
Date: Tuesday, June 20, 2000 5:41 PM
Subject: glaze course
>I have a ten lesson glaze course which I have given several times on the
>internet. If members of clay art would be interested ZI can post a lesson
>per week in two parts.
>please rspond
>hal mc whinnie
>
>___________________________________________________________________________
___
>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.
Estrellita Ammirati on wed 21 jun 00
Hal:
I would also be interested in the 10 week glaze course
on line. When will it start?
Estrellita
--- hal mc whinnie wrote:
> I have a ten lesson glaze course which I have given
> several times on the
> internet. If members of clay art would be interested
> ZI can post a lesson
> per week in two parts.
> please rspond
> hal mc whinnie
>
>
______________________________________________________________________________
> 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.
__________________________________________________
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ARTISTINSC@AOL.COM on thu 22 jun 00
MEE TOO,HAL.
MASON BATCHELDER
Cat81257@AOL.COM on thu 22 jun 00
count me in too hal thanks cat
CreatvSpce@AOL.COM on thu 22 jun 00
go hal go!!!
Glaze away with me too!
Believe it or not, I'm actually wearing a bucketful right now (so are the
walls and the stairwell), thanks to a mishap earlier with a disgruntled
mixer. Too much fun!!
Helvi
Creative Space
Juliet Johnston on thu 22 jun 00
Yes, Hal, I am intrested in taking your glaze course. Juliet
Mary Lynch on thu 22 jun 00
Hal,
That sounds like a very generous offer -- I'm also interested. When do we
get started?
Mary L.
Eloise VanderBilt on thu 22 jun 00
How many yesses does Hal need to make it a go? If one more will help, count
me in. Now we need some more details.
Bruce Gioia on thu 22 jun 00
----- Original Message -----
From: Tom Buck
Subject: Re: glaze course
> Bruce .... i think hal is offering his course separately from clayart so
> email him directly to register. good studies. bfn. peace tom b
______________________
Yes (thanks) I realized that after I pressed the send button,
but on checking for Hals private address...
it wasn't there....Oh well.
How bout it Hal,
got an address?
Bruce
ps. I've been photocopying all your
recipes from the old ceramic monthly mags I'm borrowing.
Hopefully I'll learn enough that I won't need em!
ginny bivaletz on thu 22 jun 00
me too ! ginny from orcas island, washington
--- Patrice Murtha wrote:
> I too would be interested in this course.
>
>
> >I have a ten lesson glaze course which I have given
> several times on the
> >internet. If members of clay art would be
> interested ZI can post a lesson
> >per week in two parts.
> >please rspond
> >hal mc whinnie
> >
>
>______________________________________________________________________________
> >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.
>
>
______________________________________________________________________________
> 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.
__________________________________________________
Do You Yahoo!?
Send instant messages with Yahoo! Messenger.
http://im.yahoo.com/
John Rodgers on sun 25 jun 00
Hal, I would be grateful to see this posted.
John Rodgers,
Birmingham, AL
hal mc whinnie wrote:
> I have a ten lesson glaze course which I have given several times on the
> internet. If members of clay art would be interested ZI can post a lesson
> per week in two parts.
> please rspond
> hal mc whinnie
>
> ______________________________________________________________________________
> 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.
hal mc whinnie on tue 27 jun 00
here is lesson one part one again.CERAMIC GLAZE COURSE
LESSON ONE
PART ONE
WHAT IS A GLAZE?
A ceramic glaze is basically silica or glass, which is designed to melt at a
certain
temperature. If we fired kilns to more than 3000 degrees we could probably
use pure
silica to create our glazes. The basic problem in glaze formulation it to
design a glaze
that will reduce the melting points of the silica to that at which one
fires.
The development of ceramic glaze theory was necessary to develop a reliable
ceramic glaze that could be fired at a specific temperature that is lower
then the
melting point of pure silica. A second critical issue in glazemaking was to
also develop a
mixture that would dry and remain on the ceramic ware until fired.
At the end of the 19 Th. Century Herman Seger a German chemists formulated
a method of mathematical model for the description of a ceramic glaze.
Glazes
predictable by a Seger model were developed centuries earlier by the chines
and other
oriental potters and transferred to Western Europe where they were modified
b
To specific local conditions and materials. Thus ceramic science as we know
it today had
its beginning.
The development of this online glaze course has been a challenge and has
led me
to many sources on the Internet, which I will include at various points in
this series of
lectures. I am amazed with what is available on the web, 600,000 matches to
my glaze
searches. Of course the problem is to really find what is important and I
hope that some
of what I have found in this adventure shall be useful to everyone.
A ceramic glaze consists of several important materials, which are:
A glass former the silica
A clay the alumna
A feldspar to modify the melting point of the silica
A refractory generally whiting used to complete the melting of the glaze
for a
specific temperature level.
There are certain rocks, generally the granites that when ground and refined
make
perfect glazes for the high temperatures. Curbstones in many New England
towns are a
perfect blend of silica, clay, feldspar, and chalk to be a cone 10 glaze.
The early Chinese
potters also had natural stones that when ground would form perfect glazes
according
to the Seger model.
A classic Chinese cone 8-10 glaze
Silica or flint 40
Feldspar 30
Whiting or chalk 20
Clay 10
The above describes a 40-30-20-10 proportional glaze which Bernard Leach
first
introduced into western ceramics in the early 1920"s. We shall return to
Leach and this
proportional glaze several time during the duration of this course. It is
probably the most
famous glaze in the history of 20 Th. Century ceramics. The proportional
method we
shall explore as a useful alternative to the Seger system.
The basic problem for the glazemaker is far more then to simply find a
proportional system to melt the silica. A final glaze has color, texture,
surface qualities,
and a crystalline structure. It can be very Matt and opaque or highly gloss
and
transparent. All of these qualities can be varied with the simple four
chemical elements
in our sample glaze, if we employ specific amounts of certain glaze making
materials.
There is the basic problem for all of us, the unending quest, what
proportions and which
materials for the perfect glaze.
Glaze a glaze b glaze c
Silica 40 silica 30 silica 25
Feldspar 30 feldspar 25 feldspar 20
Whiting 20 whiting 40 whiting 50
Clay 10 clay 5 clay 5
Clear gloss clear satin Matt Matt
Cone 9-10 cone 9-10 cone 9-10
The above demonstration shows that by a variation of one or two elements
the
basic proportions can be maintained but the surface qualities altered, in
this case the
reduction of the silica content as well as an increase in whiting which is
refractory
In our next lesson we shall lean more about how these elements work.
Homework
1] Take three of your favorite glazes and try to find their basic
proportional structure
2] How similar is this structure if you were to remove the colorants,
opacifiers, and
other small elements?
3 do any fit into our 40-30-20-10 framework?
Each of the 12 lessons is included in two parts. These will be attached as
files. In
addition each lesson will apper as an email message. I send the attached
files in html
format because one may wish to use as a part of a web site or print out as
text for use
with student's etc. The course shall run for 12 weeks and it will be
repeated in April and
in Oct 1999. If you have students or fellow potters who would be interested
tell them to
send me an email and they will get of the list for the next course.
After you finish the course you shall continue to get the glaze of the
week. I plan
on having an advanced course sometime late in fall 1999. At some point these
lessons
will be printed as a book for sale but you are free to copy and use as you
see fit.
FIRST WEB SITE TO VISIT
http://www.digitalfire.com/
Chem glaze software
http:/www.mdc.net/~rjwilt/software/glazechem.htm
You may wish to get your own computer program as we continue.
-----Original Message-----
From: Monique Duclos
To: halchaos5@EMAIL.MSN.COM
Date: Tuesday, June 27, 2000 10:27 PM
Subject: Re: glaze course
>Hi Hal,
>
>Judging by all those peoples that have not received the first part of your
>course ,I think maybe it wasn't send ?? Or was it and I just delete it to,
>not knowing, anyway could it be possible to have it? Please?
>Thanks
>@micalement
>Monique
>
>
>
>
>Monique Duclos
>mduclos@hotmail.com
>3757 Boul des Fondateurs
>St-Isidore Nouveau-Brunswick
>Canada E8M 1B5
>URL: http://www.angelfire.com/mo/pmdv
>
>
>________________________________________________________________________
>Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com
>
hal mc whinnie on wed 28 jun 00
since this is an experiment we have to consider some ground rules:
i will post each lesson only once on clayart
each lesson will be in two parts
any e-mails requests and questions should not be sent to the list but to me
personally.
halchaos5@email.msn.com.
hal mc whinnie on wed 16 aug 00
Hal's oxblood
Cone 9-10
Reduction
Grams % by weight
Neph syn 166 42
Buck spar 35 9
Georgia kaolin 8 2
Flint 88 22
Gertsley borate 51 13
Whiting 41 10
Copper oxide 1.17
Tin oxide 3.91
Seger analysis %mole
Sio2 3.35 65
Al2o3 0.44 8
B2o3 0.33 6
Tio2 0.02 02
Cao 0.60 11
Mgo 0.01 0.12
K2o 0.12 2.32
Na2o 0.27 5.27
MELTING POWER VERY HIGH
MELTER AMOUNT NORMAL
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