carrie jacobson on thu 20 aug 98
Hi all you experts: I mixed this recipe last night... came from Clayart a
while ago, before I got smart and collected people's names and email
addresses. At any rate, I have never used a tenmoku before, and have
questions.
This glaze was very thin, and went on very thin, even after dipping a
couple times. It has a wacky looking skim on the top, looks like the skim
that forms on pudding, but also has a waterproof-looking quality to it. And
has foamy lumps on the surface that stick like swamp mud to the pots.
I have very little glazing experience. Does this sound like everything is
OK? I have not fired the pieces yet...
Here's the glaze:
"V's" Tenmoku Gold Cone 6 (Electric Kiln)
Cornwall Stone 60
Whiting 8
Gerstley Borate 3
Iron Oxide - Red 10
Lithium Carb. 5.5
Dolomite 7
Flint 5.5
====
100
Thanks for your input,
Carrie
Carrie Jacobson
Pawcatuck, CT
mailto:jacobson@brainiac.com
Shelford on fri 21 aug 98
Hi Carrie -
Re: >This glaze was very thin, and went on very thin, even after dipping a
>couple times. It has a wacky looking skim on the top, looks like the skim
>that forms on pudding, but also has a waterproof-looking quality to it. And
>has foamy lumps on the surface that stick like swamp mud to the pots.
This one was my recipe - it shouldn't be abnormally thin, and I've never had
any kind of skim on the top. I can usually get away with a single 3-5
second dip, and it is just a very deep red colour in the raw state, no
strange precipitates.
It sounds like you may not have sieved it? (Cornwall stone needs extra
attention at the mixing stage.) And it certainly sounds like you've used
too much water - what proportion of wet to dry are you using? I suppose
it's also possible there may be ingredient differences relating to your part
of the world vs. mine - any other observations from others who have used this?
When summer's over, I'd like to take pictures of all the glazes I've posted
recipes for, and stick them up on the website, so there'll be something to
compare to.
- Veronica
(BTW - minor point, the recipe seems to have changed slightly in
transmission - mine calls for 61% cornwall stone)
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Paul Lewing on sat 22 aug 98
Carrie,
I don't know what the scum you refer to on the surfaace of this glaze
is, but I see it a lot on high-iron glazes. But I don't see it with
all forms or brands of iron. So I assume this is why you see it but
others don't get it. As far as I know, it doesn't affect the glaze.
Paul Lewing, Seattle
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