John Britt on thu 2 dec 04
Kate,
If it is granular ilmenite you can make some nice speckled glazes with it.
Like a robin's egg blue.
You can also make a rutile and ilemenite wash for use over temmoku's.
Hope that helps,
John Britt
www.johnbrittpottery.com
Kate Johnson on thu 2 dec 04
Hi, all--
I was organizing my pottery supplies not too long ago and came across a
cache of stuff I bought probably four years ago. One item is a 1 lb. bag of
ilmenite, and I have NO idea what I had planned to do with it, unless I
wanted to sprinkle a few crystals onto a glazed pot before it dried to
approximate the effect of woodfiring--that rings a bell.
I looked it up in the Connell book (I've loaned out my John-and-Ron, darn
it!), and it just mentions it in the Crystalline Glazes section on p. 106 as
being useful. None of the glaze recipes on that page contain ilmenite,
so....suggestions? I don't find it in our
http://www.potters.org/categories.htm as such.
Now that I'm feeling more adventurous I'd like to put it to use...
Regards,
Kate Johnson
Graphics/Fine Arts
http://www.cathyjohnson.info/
http://www.epsi.net/graphic/
http://www.ebsqart.com/Artists/cmd_1494_profile.htm
David Hewitt on fri 3 dec 04
Kate,
One use I have for Ilmenite is to slightly change an oatmeal semi matt
glaze to a darker oatmeal with more specs. It is a cone 8 recipe which I
fire in oxidation. The recipe is as follows:-
Cornish stone 500
China clay 220
Whiting 60
Dolomite 230
Talc 100
____
1110
Ilmenite 50
You can see what the base glaze looks like on a buff stoneware body on
my web site under 'Stoneware Vases Bowls & Planters', but I do not have
an example with the addition of the Ilmenite.
http://www.dhpot.demon.co.uk
David
In message , Kate Johnson writes
>Hi, all--
>
>I was organizing my pottery supplies not too long ago and came across a
>cache of stuff I bought probably four years ago. One item is a 1 lb. bag of
>ilmenite, and I have NO idea what I had planned to do with it, unless I
>wanted to sprinkle a few crystals onto a glazed pot before it dried to
>approximate the effect of woodfiring--that rings a bell.
>
>I looked it up in the Connell book (I've loaned out my John-and-Ron, darn
>it!), and it just mentions it in the Crystalline Glazes section on p. 106 as
>being useful. None of the glaze recipes on that page contain ilmenite,
>so....suggestions? I don't find it in our
>http://www.potters.org/categories.htm as such.
>
>Now that I'm feeling more adventurous I'd like to put it to use...
>
>Regards,
>Kate Johnson
>Graphics/Fine Arts
>http://www.cathyjohnson.info/
>http://www.epsi.net/graphic/
>http://www.ebsqart.com/Artists/cmd_1494_profile.htm
--
David Hewitt
Web:- http://www.dhpot.demon.co.uk
Lou Roess on fri 3 dec 04
> here is an interesting C10 reduction glaze I tested this year.
> The code M is indication the Magnesia "ian currie tile " and the number
> is the recipe number.
>
>
> John, what color is it?
Lou in Colorado
John K Dellow on fri 3 dec 04
Kate ,
here is an interesting C10 reduction glaze I tested this year.
The code M is indication the Magnesia "ian currie tile " and the number
is the recipe number.
Rember this is an Australia set of ingredients. If you have "Insight
Glaze Calculation " programme you can down load analysis of the Aussie
raw materials from the digital fire web site. Otherwise I would just sub
your local raw materials.
John
M24IL - M24 plus iron & illmanite
=================================
Whiting Omycarb20... 8.90 8.48%
Potash Feldspar 200F 32.99 31.42%
DOLOMITE............ 13.53 12.89%
Clay HR1............ 9.58 9.12%
SILICA.............. 35.00 33.33%
*Illmenite........... 1.00 0.95%
*Red Iron Oxide...... 4.00 3.81%
========
105.00
CaO 0.66* 14.14%w 15.62%m
MgO 0.19* 2.96 4.55
K2O 0.10* 3.46 2.28
Na2O 0.06* 1.32 1.32
Fe2O3 0.00 0.25 0.10
TiO2 0.01 0.17 0.13
Al2O3 0.26 9.98 6.06
SiO2 2.94 67.71 69.94
Si:Al 11.53
EXPAN686.10
John
John Dellow "the flower pot man"
From the land down under
Home Page http://www.welcome.to/jkdellow
http://digitalfire.com/education/people/dellow/
Bruce Girrell on fri 3 dec 04
I have a request: Please tell us something about the particle size of
ilmenite that you are using. My experience is that the ilmenite effect
varies drastically with particle size.
Bruce Girrell
who has three different ilmenite glazes downstairs,
none of which comes close to the desired effect obtained
on a pot fired a few years earlier,
despite using the same recipe
Ron Roy on sat 4 dec 04
Hi Kate,
Illmanite is like rutile but with more iron - so it will produce attractive
specks in a glaze if the glaze is melting enough. If not melting enough the
specks are not very interesting.
It will tend to settle out quickly to constant stirring is necessary.
Illmanite comes in different mesh sizes - some is just powder and can be
used like rutile but will produce a darker colour because of the extra
iron.
I would not be surprised if the grains would be excellent seeds for
starting crystal growth.
RR
>I was organizing my pottery supplies not too long ago and came across a
>cache of stuff I bought probably four years ago. One item is a 1 lb. bag of
>ilmenite, and I have NO idea what I had planned to do with it, unless I
>wanted to sprinkle a few crystals onto a glazed pot before it dried to
>approximate the effect of woodfiring--that rings a bell.
>
>I looked it up in the Connell book (I've loaned out my John-and-Ron, darn
>it!), and it just mentions it in the Crystalline Glazes section on p. 106 as
>being useful. None of the glaze recipes on that page contain ilmenite,
>so....suggestions? I don't find it in our
>http://www.potters.org/categories.htm as such.
>
>Now that I'm feeling more adventurous I'd like to put it to use...
>
>Regards,
>Kate Johnson
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
John K Dellow on sun 5 dec 04
Lou good question . With the illmanite I used at college its an opaque
semi mat off white,
with a small amount of fine brownish speckles. This was on clayworks JB3
which is a white stoneware clay.
John
John Dellow "the flower pot man"
From the land down under
Home Page http://www.welcome.to/jkdellow
http://digitalfire.com/education/people/dellow/
Ivor and Olive Lewis on sun 5 dec 04
Dear Ron,
If, as you say, the glaze is not melting enough to cause the Ilmenite
to show its character does this mean that the iron is not behaving as
a flux and enhancing the melting?
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
> Hi Kate,
Illmanite is like rutile but with more iron - so it will produce
attractive specks in a glaze if the glaze is melting enough. If not
melting enough the specks are not very interesting.<
Ron Roy on sun 5 dec 04
Hi Ivor - my experience with unmelted illmanite was mostly in oxidation
when I we teaching - it worked very well in a silica short glaze - nice
light brown specks - but did not melt well in more balanced glazes - did
not melt and stayed as a black speck - almost like a pin hole would look.
I did add a bit of granular illmanite to a clay matt glaze I use to use in
reduction firing at cone 10 - it melted well.
I think you are right - it would work better in reduction firing because
the extra iron would help the fluxing.
Anyone care to do some experiments - I have granular illmanite. Same glaze
fired in oxidation and reduction.
RR
>Dear Ron,
>If, as you say, the glaze is not melting enough to cause the Ilmenite
>to show its character does this mean that the iron is not behaving as
>a flux and enhancing the melting?
>Best regards,
>Ivor Lewis.
>Redhill,
>S. Australia.
>
>
>> Hi Kate,
> Illmanite is like rutile but with more iron - so it will produce
>attractive specks in a glaze if the glaze is melting enough. If not
>melting enough the specks are not very interesting.<
>
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Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
John K Dellow on mon 6 dec 04
Ron
I can send you a scan of 3 ian currie tiles with illmanite flower addition to a base glaze.
One tile is an iron clay in reduction and the other two are white clay, one in reduction and the other in oxidation.
John Dellow "the flower pot man"
From the land down under
Home Page http://www.welcome.to/jkdellow
http://digitalfire.com/education/people/dellow/
Ron Roy on wed 8 dec 04
Hi John,
Is the effect like rutile but darker.
I would like to see the tiles but I have a slow dial up connection - can
you keep em under 100K each?
RR
>Ron
>
>I can send you a scan of 3 ian currie tiles with illmanite flower addition
>to a base glaze.
>One tile is an iron clay in reduction and the other two are white clay,
>one in reduction and the other in oxidation.
> John Dellow "the flower pot man"
> From the land down under
>Home Page http://www.welcome.to/jkdellow
>http://digitalfire.com/education/people/dellow/
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
John K Dellow on thu 9 dec 04
Ron,
the results I have are not quite what you were asking about . The 3
tiles have a base glaze with additions of , from top right :-
6% ilmenite flower grade
5% nickel (green)
5% iron chromate
2.2% zinc
5% chrome (green)
6% rutile granular
10% Zircon
This is a Greg Daly 28 step colour evulation test. I used a currie tile
for convienence, but I should have place my test glazes in the
configuration which would have allowed the 7 oxide additions to be on
the same line :).
As you will see the ilmenite was blue and the rutile pink. I think the
pink might be as a result of the chrome valatising ?.
The base glaze is:-
Potash feldspar 200F 43.13
Talc 4.54
whiting omycarb 20 18.16
Kaolin K1 10.83
Silica 200# 23.33
I have enjoyed study this year and have done a lot of tests which I have
wanted to do for a long time. I am finding the Currie method is giving
me a better understanding of the process and the Daly colour sets to
try out lots of oxide combinations , and then finish up by adjusting the
final glaze with Insight .
John
P.S. next year I start testing Eckalite in engobes and throwing white
poop :).
--
John Dellow "the flower pot man"
From the land down under
Home Page http://www.welcome.to/jkdellow
http://digitalfire.com/education/people/dellow/
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