Jim Tabor on sun 7 apr 02
Snail-
At close inspection (50X), the granular illmenite in an ox. ^6 glaze melts. Most
spots are yellow brown with a dark spec inside the spot. The smaller particles
melted completely. On the largest spots (.6mm), the dark spot was .2mm. and small
specks (.2mm) had dark spots of .1mm. The indentions from the spots are lowest
with the dark spec melted into the glaze. Some have edges where the effect is like
a crater from the melted illmenite.
The only sample I have at home to look at is a stiff white matte. As I recall,
other glazes (gloss) had more craters from the granular illmenite (like a geode)
without the dark specs. I stopped using granular illmenite on functional surfaces
after observing the effect up close.
The best distribution for spots comes from brushing the glaze on the ware.
I hope this helps,
jt
http://home.earthlink.net/~taborj/index.html
Valerie Hawkins wrote:
> -----Original Message-----
> From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.CERAMICS.ORG]On
> Behalf Of Snail Scott
> Sent: Thursday, April 04, 2002 12:06 PM
> To: CLAYART@LSV.CERAMICS.ORG
> Subject: Re: Cone 6 glaze--speckling with granular illmenite
>
> At 08:35 AM 4/4/02 -0500, you wrote:
> >I've tried granular ilmenite to color a glaze and all I got was granular
> >ilmenite. It didn't melt at cone 6. Are there certain glaze ingredients
> >that will promote melting? I was using Hanson's 5X20.
>
> Granular ilmenite won't melt - the particle size is
> too big. That's why it's used for speckles. For color,
> you would need to use powdered (milled) ilmenite.
> This is not a readily available material.
>
> Ilmenite may be considered a close cousin of rutile,
> being also composed of titanium and iron, but it has
> more iron than rutile. (The iron content of rutile is
> variable, but always less than ilmenite as far as I
> know.) Most people, when looking to add iron and
> titanium to a glaze for color, choose rutile for the
> purpose, as it can be readily obtained in powdered
> form. If you want more iron than rutile will provide,
> just add a little RIO to the recipe.
>
> -Snail
>
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