John Post on wed 24 jan 07
Last week there was a thread about creating a glaze with Zinc as its
main flux at cone 6.
I was browsing through Ian Currie's book and saw that he recommended
trying .7 moles of Zinc as a flux.
I ran a grid tile with that in mind.
You can see the results here...
http://www.wideopenwest.com/~jpost4400/
The surprising result in this glaze grid was that the smoothest glaze
was near the top right corner.
I surmise that this is because the zinc was matting most of the
glazes... they were too fluxed.
The number 4 tile had the right amount of alumina and silica to balance
out the excess zinc.
Cheers,
John Post
Sterling Heights, Michigan
Donna Kat on thu 25 jan 07
I don't see how 'too much flux' would give you a matt. I can see how
having nothing to melt (silica) with the flux would.
Donna
On Wed, 24 Jan 2007 21:09:19 -0500, John Post
wrote:
>Last week there was a thread about creating a glaze with Zinc as its
>main flux at cone 6.
>I was browsing through Ian Currie's book and saw that he recommended
>trying .7 moles of Zinc as a flux.
>I ran a grid tile with that in mind.
>You can see the results here...
>http://www.wideopenwest.com/~jpost4400/
>The surprising result in this glaze grid was that the smoothest glaze
>was near the top right corner.
>I surmise that this is because the zinc was matting most of the
>glazes... they were too fluxed.
>The number 4 tile had the right amount of alumina and silica to balance
>out the excess zinc.
>
>Cheers,
>John Post
>Sterling Heights, Michigan
>
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Timothy Joko-Veltman on thu 25 jan 07
The matte-ness is not a function of the "fluxing" activity of the
zinc, but of it's crystallization. The same is true for mattes made
with Ca, Mg, Ba, and Sr.
Cheers,
Tim
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