Terpstra Karen K on tue 20 feb 01
Hi All,
I have a student looking for "Nebula" glaze. It's a blue where thick
and breaks to green where thin. Please contact me if you have heard of
it.
Thanks,
Karen Terpstra
University of Wisconsin-La Crosse
Greg Lamont on wed 21 feb 01
Hi Karen,
Minnesota Clay USA has a commercial glaze called Nebula. It's a slip
glaze--#SG-2-- and is rated to fire from cone 5-8. No information is given
as to whether it performs equally in oxidation or reduction. Minnesota Clay
can be contacted at 800-CLAY-USA and they also have a web site, but I don't
have the URL handy.
Disclaimer:
I have no connection whatsoever with Minnesota Clay USA, and will derive no
financial benefit from providing this information.
Hope this is what you're looking for.
Greg
-----Original Message-----
From: Terpstra Karen K
To: CLAYART@LSV.CERAMICS.ORG
Date: Tuesday, February 20, 2001 1:38 PM
Subject: "Nebula" glaze?
>Hi All,
>
>I have a student looking for "Nebula" glaze. It's a blue where thick
>and breaks to green where thin. Please contact me if you have heard of
>it.
>
>Thanks,
>Karen Terpstra
>University of Wisconsin-La Crosse
>
>___________________________________________________________________________
___
>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.
>
Yvon LeDouget on wed 21 feb 01
Bonjour Karen
Allez sur www.google.com et tapez "nebula glaze" vous aurez :
store.yahoo.com/fireborn/nebulaglaze.html
www.barra.se/stoneware/svensk/glasyrbilder/glazepict.htm
http://www.fireborn.com/fireborn/nebulaglaze.html
Bonne recherche Yvon Le Douget
Ian Currie on thu 22 feb 01
Hi Karen
I've never heard of "Nebula Glaze" but a grid experiment we did on my last
tour of the US produced something that might be like it. I checked out the
URL's kindly provided by Yvon LeDouget but they didn't seem to fit the
description. So I thought I might tell you about this experiment. It was
an attempt to produce a good Cobalt/Titanium green at midfire in oxidation,
with a stoneware Reitz Green as the starting point.
To cut a long story short, we got some very nice Reitz Green type glazes at
midfire, and also some that were merging into blue, and had very interesting
mottled blue where thick and matt green where thin.
The best result similar to what you describe was Glaze 21 on the grid.
The Glaze-C for the grid was:
55 Neph Syenite
10 Spodumene
6 Whiting
4 Ferro frit 3134
25 Ferro frit 3110
+1% cobalt carbonate
+3% rutile
This is NOT the glaze recipe. This recipe is the bottom left corner of the
grid, and contains zero clay and zero quartz. This recipe is used to
calculate all the other glazes in the grid.
To get the recipe for Glaze 21, go to my website:
http://ian.currie.to/
and click on the "Calculation Page". Read the instructions there, and then
input this Glaze C into the appropriate boxes at the bottom of the page.
[The first 5 materials above are flux materials. The last 2 are colourant
and opacifier in that order. You need to know this to put them into the
correct boxes.] Then click the "Calculate Now" button. This will produce a
list of 35 glaze recipes - the recipes for the grid.
Alternatively, to get the recipe(s) you can use the tables in the back of my
new book: "Revealing Glazes - Using the Grid Method", which you can buy at
the above website.
Read off the recipe for Glaze 21. It MIGHT work! There are however many
potential traps between the result on my once-only-tried new grid and what
your student might mix up. Therefore I would recommend you/they mix up at
least all of the glazes around Glaze 21. (Look at the diagram at the top of
the "Calculation Page" - that shows the layout of the 35 glaze numbers.)
You could do the whole grid if you like, but for this glaze you are probably
only interested in the left hand 1 or 2 vertical rows.
I could just give you the recipe for #21 of course, but your chance of
getting what you want is much less if I do that than if you follow the
instructions above. One of the features of the grid method is that it has
built in a range of values of alumina and silica that compensate and balance
out for a whole heap of possible differences between what we mixed up and
what you or your student might mix. It also compensates to some degree for
firing and clay differences. The question becomes not "will the glaze
recipe work", but "are we lucky, and which of the 35 glazes will give the
effect".
And of course someone might just give you the recipe you want!! :) Which
ever way... good luck
Ian Currie
-----Original Message-----
From: Terpstra Karen K
To: CLAYART@LSV.CERAMICS.ORG
Date: Tuesday, February 20, 2001 3:09 PM
Subject: "Nebula" glaze?
>Hi All,
>
>I have a student looking for "Nebula" glaze. It's a blue where thick
>and breaks to green where thin. Please contact me if you have heard of
>it.
>
>Thanks,
>Karen Terpstra
>University of Wisconsin-La Crosse
>
>___________________________________________________________________________
___
>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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