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cone 10 moonlight glaze

updated fri 31 may 96


Numo Jaeger on mon 20 may 96

Howdy you all!!

Does anyone out there have a glaze recipe called "moonlight" which has
granular illmenite in it to give it "moonlight like" qualities? My co-worker
at school seems to have misplaced his recipe. Any assistance would be greatly


Numo jaeger

Sam Cuttell on mon 20 may 96

At 12:01 PM 5/20/96 EDT, you wrote:
>----------------------------Original message----------------------------
>Howdy you all!!
>Does anyone out there have a glaze recipe called "moonlight" which has
>granular illmenite in it to give it "moonlight like" qualities? My co-worker
>at school seems to have misplaced his recipe. Any assistance would be greatly
>Numo jaeger
Should anyone find this interesting sounding recipe, please respond to the
whole group, not privately as I'm sure there are more than a few of us
intrigued by the sound of this glaze!! :)

sam - alias the cat lady
proud foster mom of 3 puppies!

June Perry on mon 20 may 96

Here is a recipe for Moonlite cone 10 R. Chun glaze

63.8 Cornwall Stone
14.3 Colemanite
7.6 Flint
7.6 Whiting
4.8 EPK
1.9 Zinc Oxide

Add: Rutile 3.2%, Powdered Illmenite 2.
You can also do a test with the granular illmenite to see the difference. I
use the powdered illmenite.
This glaze can go anywhere from a very pretty light blue with pink/lavendar
tones to a deep rich purplish blue with lots of texure and interest. It all
depends on the claybody and the heat and amount of reduction. The heavier the
reduction the darker it will be. On porcelain and whiteware it will tend more
toward the pale blue, lavendar and/or pink and cream. It is best fired at
cone ten about two or three o'clock. It tends to run and pinhole if fired to
a flat cone 10. Usually these chun glazes look their best when they are
about to slide off the pot making their firing quite a challenge. This glaze
should be applied not too thickly as this will increased the chance of
running, but it should' nt be applied thin either or it won't develope the
best color.
You can also try varying the amounts of rutile and illmenite or just using
between 4 and 6 per cents of rutile alone for another version. It is one of
my standard glazes and I love the variety and the challenge this glaze
presents. It looks great on mugs and jars using an iron red glaze on the
interior and upper portion and the moonlite on the bottom.
Let me know how it turns out for you.

June Perry

yee vian shin on tue 21 may 96

hello Numo jaeger and everyone in clayart.
My university do have a receipe called MOON LIGHTING for cone 10 in reduction.
Moon lighting cone 10
Cornwall stone 64
gerstley borate 14
flint 7.6
whiting 7.6
kaolin 5
zinc oxide 2
rutile 3.2
gran. ilmenite 2

hope this reciepe is what you want.

frankie yeevia

Tom Buck on tue 21 may 96

June P: Sounds like a good glaze. But pray tell me where are you buying
your Colemanite? Has not been available in eastern NA for many years. And
if you suggest subsititute Gerstley Borate instead, please tell me how
you reconcile a material with 40% B2O3 with one that has at last
published info a B2O3 content of 28%. Do you make some adjustment?
Based on the numbers Gerstley Borate does not equal Colemanite on a gram
for gram substitution but lots of people do that. TTYL TomB Hamilton Canada on thu 23 may 96

The formula for this glaze has already been posted so I'll not repeat it
here. Only want to add that this is a glaze that responds to iron either in
the clay or as an oxide applied beneath the glaze. When made with uncalcined
Cornwall stone and applied over dark clays like death valley (Laguna) it is
blue and mustard yellow speckled, more yellow with more iron. When used over
light clays (I use B-mix) it has a beautiful lavender mottled appearance.
Applying RIO under the glaze yields more blue tones and less lavender. The
forgoing is for reduction ^10, have never tried this in oxidation.

Since this galze contains significant Cornwall stone, I was interested in the
earlier thread about calcined vs non-calcined cornwall stone. My first
experiments with Moonlight were with the white Cornwall stone, which I
learned from the Clayart Community is the calcined variety. The results were
so dismal on white stoneware I almost wrote it off (dull beige). Except I
tried it on dark stoneware (again DV) trying to get beige and... surprise I
got a lovely blue with some yellow speckles. The next batch of Cornwall
stone I got was the robins-egg blue variety which I now understand is the
uncalcined version. Applied over dark stoneware I got less blue and more
mustard (kinda yucky) but over white stoneware with the RIO got the lovely
results described in the first paragraph.

Liz Dodge at the Potters Studio in Berkeley, where we have a little rain and
a little earth shaking (4.7) and life is sweet.

This glaze has a tendency to crawl a bit but is not runny and is otherwise
well behaved.

June Perry on thu 23 may 96

Dear Liz:

I used the blue Cornwall Stone with Moonlight Glaze and get blue on iron
bearing bodies. The only time I would get the yellowish/mustard would be if
there wasn't enough reduction. I don't calcine the Cornwall stone. It don't
have any crawling with this glaze but it can run if fired to a flat cone 10.
So I usually aim for cone 10 somewhere between one and four o'clock.

June Perry

Christine Fennimore on fri 24 may 96

Has anyone tried this moonlight glaze in a salt firing? I will be doing
one in a week or so and wondered if anyone could give me any feedback.

June Perry on sat 25 may 96

I haven't salt fired this glaze. I would sure be interested in your results.

June Perry