Susan Fox on fri 21 jan 05
I'm wondering whether anyone knows a resource for analyzing a glaze to
discover its recipe. I dumped a bunch of tests and unwanted glazes together
last year, calling the result "Probly Green". When fired, it proved to be
really lovely. At cone 6 oxidation it's copper-green where thin, soft
turquoise where it gathers. Alas, I have no idea what went into it! Is
there any glaze wizard who can figure it out, either from a wet, unfired
sample or a fired one? Alternatively, does anyone have a glaze that seems
similar that they would be willing to share? I'd be most appreciative.
- Susan
Ivor and Olive Lewis on sat 22 jan 05
Dear Susan Fox,
It's at times like these that you need a "Minty".
Well, Green where thin and Turquoise where thick suggests Copper
Oxide, probably modified with Barium Carbonate but that is only a wild
guess.
The expensive way to find out is to send a sample to an analytical lab
and ask for a quantitative analysis of the metallic oxides and silica,
which I feel would be a rather pricey option.
If you have records of what you have made over time you may be able to
cobble something or get a hint as to whether there is a common basic
recipe
Hope you sort something out.
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
Cindy in SD on thu 27 jan 05
Hey, sounds like you've got a limited edition, one-of-a-kind, once
they're gone, they're gone situation here. Should make it worth, oh, ten
times the normal price, right?
Cindy in SD
Des & Jan Howard wrote:
> Susan
> We had a 44 gal drum of a "you beaut!" scrap glaze
> which is now a 5 gal drum of much requested glaze.
> Very extensive testing hasn't duplicated it yet.
> Analysis seems to be the next step.
> As the minerals that went into the rejected glazes
> are known just the oxide percentages will do.
> Des
>
>
Ivor and Olive Lewis on fri 28 jan 05
Dear Des,
If it is important to reproduce such a "|Feral "glaze for commercial
reasons these seem to me to be a reasonable charges for quantitative
values of the oxides in a mixture. After all, it would be a legitimate
cost against business income.
How you reproduce yours successfully.
Best regards,
Ivor ...what would I do without a Mintie....Lewis.
Redhill,
S. Australia.
Des & Jan Howard on fri 28 jan 05
Susan
We had a 44 gal drum of a "you beaut!" scrap glaze
which is now a 5 gal drum of much requested glaze.
Very extensive testing hasn't duplicated it yet.
Analysis seems to be the next step.
As the minerals that went into the rejected glazes
are known just the oxide percentages will do.
Des
Susan Fox wrote:
>I'm wondering whether anyone knows a resource for analyzing a glaze to
>discover its recipe. I dumped a bunch of tests and unwanted glazes together
>last year, calling the result "Probly Green". When fired, it proved to be
>really lovely. At cone 6 oxidation it's copper-green where thin, soft
>turquoise where it gathers. Alas, I have no idea what went into it!
>
>
--
Des & Jan Howard
Lue Pottery
LUE NSW 2850
Australia
Ph/Fax 02 6373 6419
http://www.luepottery.hwy.com.au
Des & Jan Howard on fri 28 jan 05
Ivor
Geez! You incomers !
"It's times like these, you need Minties"
Current analysis charges ex Sydney
Commercial lab
A$130 10 oxides, A$30 each additional oxide.
University lab
A$55 12 oxides
Des
Ivor and Olive Lewis wrote:
>Dear Susan Fox,
>It's at times like these that you need a "Minty".
>Well, Green where thin and Turquoise where thick suggests Copper
>Oxide, probably modified with Barium Carbonate but that is only a wild
>guess.
>The expensive way to find out is to send a sample to an analytical lab
>and ask for a quantitative analysis of the metallic oxides and silica,
>which I feel would be a rather pricey option.
>If you have records of what you have made over time you may be able to
>cobble something or get a hint as to whether there is a common basic
>recipe
>
>
--
Des & Jan Howard
Lue Pottery
LUE NSW 2850
Australia
Ph/Fax 02 6373 6419
http://www.luepottery.hwy.com.au
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