Edouard Bastarache on thu 19 aug 10
Randy,
maybe it is the high amount of magnesium carbonate that is causing the
problem,especially in connection with the high
amount of ball clay.
High amounts of MgCO3 plays dirty tricks,
so does high amounts of lithium carbonate.
Rub in the raw glaze onto the pot while it
is still sort of damp. That is why I only use very small amounts
of MgCO3 now.
The same goes for lithium, only up to 5%.
Gis,
Edouard Bastarache
Spertesperantisto
Sorel-Tracy
Quebec
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> ----- Original Message -----=3D20
> From: "Randy McCall"
> To:
> Sent: Thursday, August 19, 2010 7:58 AM
> Subject: Ball Crawl Glazes?
>
>
> I am having trouble with ball crawl glazes drying, cracking and then=3D20
> falling off the sides of the pots. Falling off the sides is the proble=
=3D
m I=3D20
> would like to resolve.
> Does anyone have a ball crawl that adheres to the pot better than I hav=
=3D
e=3D20
> or do you have any tricks you use?
>
> This is what I am using.
>
> Recipe Name: Lanas Crawl Glaze
> Cone: 6 Color: white
> Firing: Oxidation Surface: Beaded
> Amount Ingredient
> 60 Nepheline Syenite
> 22 Magnesium Carbonate
> 18 Ball Clay Number 1
> 100 Total
>
> Unity Oxide
> .241 Na2O
> .077 K2O
> .662 MgO
> .02 CaO
> 1.000 Total
> .489 Al2O3
> .003 Fe2O3
> 2.023 SiO2
> .007 TiO2
> 4.1 Ratio
> 75.9 Exp
> Calculations by GlazeMaster=3D99
> www.masteringglazes.com
> ------------------------------------
>
>
> Randy
>
>=3D20
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