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glaze test for woka slip glaze, cone 6 ox. (?).

updated sun 4 nov 01


Alisa og Claus Clausen on wed 10 oct 01

Glaze test for:  WoKa Slip Glaze, cone 6 ox. (?).

All tests fired on white, mid-range stoneware.

Fired in to cone 6 (1220c) in oxidation.

Firing ramp:

100c (212f) per hour to 600c (1112f)

150c (302f) per hour to 1100c (2012f)

100c per hour to 1220c (2228f)

15 - 30 minute soak depending on matts and glosses used.


50 Nepheline Syenite

25 Kaolin

6 Wollastonite

19 Ball Clay


12 Zircopax


All raw materials measured up or down to nearest whole decimal.

Oxides used on percent basis to a 100 gram batch of glaze.


This is the same recipe as WoDo White glaze, but I subbed the
Dolomite for Kaolin to try to dry it out.

Resulted in:

A very dry white glaze or a white slip with additives.

I only fired it to cone 6, but maybe someone can try it higher.  I
think it could fire up to 8.

I am just curious if the surface will be any different, more fused
and glaze like.

Next tests I will color it. 

The Desert slip (50 Borax/50 Zircopax, did great with colorants that are
fluxes.  The cobalt gave it a

slightly more melted surface, with a grey and blue color.  Good feel
and handsome, understated blue.

The stains fire more or less to the same color they are in the slurry,
but dry as the original surface.

Best regards, Alisa

in Denmark

John Hesselberth on sat 3 nov 01

on 11/2/01 7:06 PM, C.Burkhart at sotovoce@WANS.NET wrote:

> Alisa wrote: > I am overly anxious about the book
>> you are writing with John. I am just testing all his cone 6 glazes. I am
>> happy to have recipes that are tested. I cannot wait to get my hands on
>> your collaboration when it is printed.
> I totally agree, Alisa. I am soon to complete my "official" schooling in
> ceramics and have put together a modest studio consisting of a new Bailey
> wheel, a small Skutt, a large used L&L and slab roller (recently purchased
> from a Clayarter). Lots and lots of lidded buckets sit idly collecting dust
> in a corner....all impatiently waiting....... waiting......waiting for this
> new book that will bring them into action and add that touch of class,
> er... glass. It doesn't get any better than this.

Thanks to you both, but patience, patience--all good thing take time. Ron is
out negotiating with printers now. The final editing and layout adjustments
are almost done. We have even put the index together which is just about
the last thing you do before you print. The cover photo was shot by a
professional photographer and the cover design will be final in another week
or so. I am working on our new website where you will be able to learn all
about the book--well, not the secret stuff--you have to buy it to learn

Anyway, we are having a great time and learning lots and lots as we work
through the challenges of bringing this book to life.



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"The life so short, the craft so long to learn." Chaucer's translation of
Hippocrates, 5th cent. B.C.