Julie Milazzo on mon 24 jun 02
Ahhh... good to know. Thanks for such a speedy
response. I have already glazed the pieces, but since
they weren't my best pieces anyway, I did the whole
thing, but I'll stick them on wads on "cookies". This
way, we can get an accurate reading of what to expect
running-wise and as far as interior/exterior color
without jeopardizing her shelves. This is mainly to
check for color, as we both have seen the salt glaze
on porcelain, but I think we're both looking to expand
our ranges of decoration without too much additional
expense/effort. Anyway, thanks! Jules
--- Dannon Rhudy wrote:
> ..... I've been invited to put some of my pieces in
> >a friend's salt/soda kiln....a bit paranoid about
> the
> >salt affecting and fluxing my glazes. ......
>
> If you glaze only the inside and the rim, and let
> the salt glaze
> the rest of it, you should not have problems with
> "puddles".
> If you want additional exterior decoration, use
> slips. The
> salt won't "glaze" areas that are already glazed,
> but will
> glaze over slips.
>
> regards
>
> Dannon Rhudy
>
>
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Julie Milazzo on mon 24 jun 02
Hey all, I've been invited to put some of my pieces in
a friend's salt/soda kiln onm Thursday. We both are
interested in seeing how my glazes look in her kiln
(her tenmoku looks amazing, but amazingly different in
both of ours...), but I'm a bit paranoid about the
salt affecting and fluxing my glazes. I don't want to
leave puddles behind, and I still have an image in my
head of the first salt firing I ever did at Fredonia
State, where Marv Bjurlin nearly needed stitches due
to my runny pot breaking off the shelf and cutting him
up. Are there any particular glaze chemicals that
could be highly affected by the salt? I'm thinking
high iron glazes could be particularly problematic.
She's also adding a bit of wood to this one, so I know
there'll be some great deposits; I just want tpo be as
safe and respectful of her time and her shelves as I
can... Thanks for any help out there! Jules
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Dannon Rhudy on mon 24 jun 02
..... I've been invited to put some of my pieces in
>a friend's salt/soda kiln....a bit paranoid about the
>salt affecting and fluxing my glazes. ......
If you glaze only the inside and the rim, and let the salt glaze
the rest of it, you should not have problems with "puddles".
If you want additional exterior decoration, use slips. The
salt won't "glaze" areas that are already glazed, but will
glaze over slips.
regards
Dannon Rhudy
iandol on tue 25 jun 02
Dear Julie Milazzo
This is an interesting proposition. Since your friend is already doing =
this and your glazes must contain very similar raw materials to those =
she uses, she seems to be assured that there will be no problems, no =
catastrophes and no nasty shocks.
Having said that there is a long standing paradigm that common place =
stoneware glazes misbehave when subject to the influence of Sodium =
Chloride in a firing. The same ideas have not been applied to Sodium =
Carbonate as far as I know.
Predicting what might happen is a can of worms. Your friends firing =
temperature is not stated nor is there any indication of the maturity =
values of your own glazes. You are not telling us if it is NaCl or =
Na2CO3 which will be used. Adding Woodash introduces a third variable, =
increasing the uncertainty of giving a reasonable prediction. Add to =
that our lack of knowledge of the precise chemistry of the process and =
you are in unknown territory.
If you suspect that there may be a repeat of that other experience, I =
would certainly set the pots in catchers with a lot of powdered =
aluminous refractory beneath them, to guard against the effects of an =
accident.
On one point I can be certain. Reassert from the 1950s tells us that =
Sodium chloride reacts with clay to release many elements as volatile =
chlorides. Prominent among the effluent compounds detected were Ferric =
(Iron)chloride, Potassium chloride, Silicon tetra-chloride and Chromium =
chloride. If that happens with a clay surface, consider what might be =
happening to any glaze materials you emplace on your pots.
Not much more I can say.
Best regards,
Ivor Lewis. Redhill, South Australia
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