Craig Martell on tue 12 nov 02
Hi:
The glaze recipe that you sent will form crystals with Mg and Ca. You get
a couple of pyroxene possibilities as in Enstatite or magnesium silicate
and Diopside which is a Mg/Ca silicate crystal. Lithium will also
contribute to crystals.
If you are having problems with crazing due to crystal growth, you can
speed up the cooling rate in your glaze fire and cut or eliminate crystal
growth. There are other ways to deal with this but if you can cool faster
and this helps, you won't need to alter the glaze.
regards, Craig Martell Hopewell, Oregon
Carol Tripp on wed 13 nov 02
I want the crystals. I love the crystals. But they are the culprits behind
the crazing? Ok. I can live with that and now I can go back to any of my
tests made on the way down from a CoE 7.07 Insight to the present CoE 6.38
Insight, pick my favourites and away I go.
I have located "Enstatite" in Hamer&Hamer and I will spend the morning
pouring over that section. Thanks for the lead.
Best regards,
Carol
Craig wrote:
>The glaze recipe that you sent will form crystals with Mg and Ca. You get
>a couple of pyroxene possibilities as in Enstatite or magnesium silicate
>and Diopside which is a Mg/Ca silicate crystal. Lithium will also
>contribute to crystals.
>
>If you are having problems with crazing due to crystal growth, you can
>speed up the cooling rate in your glaze fire and cut or eliminate crystal
>growth. There are other ways to deal with this but if you can cool faster
>and this helps, you won't need to alter the glaze.
>
>
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