Lily Krakowski on sat 26 apr 03
Ivan: I am assuming you consider the amount of GB too small for the boron
to affect the color? Hence you are willing to eliminate it?
iandol writes:
> Dear Lois,
>
> If it is your intention to continue with Cone 10 flat to the floorboards with this glaze:
>
> Felspar-(Custer) 51.0, Silica 21.0, Whiting-(vicron) 13.0
>
> Gerstley borate 6.0, Soda ash 4.0, Barium carb 4.0
>
> Lithium carb 1.0,
>
> I suggest your stiffen it up a bit by excluding the low temperature melting fluxes. So leave out the Gerstley Borate and the Soda Ash. To help improve the viscosity and reduce flow even further I would bring the recipe back up to 100% by adding 10% Kaolin. At Cone 10, this should dissolve into the melt and not alter the other qualities of your glaze.
>
> Best regards,
>
> Ivor
>
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Lili Krakowski
P.O. Box #1
Constableville, N.Y.
(315) 942-5916/ 397-2389
Be of good courage....
iandol on tue 29 apr 03
Dear Craig Martell,=20
Thank you for supporting my opinion. I agree with you about the =
Copper/Barium nexus.=20
You are also correct about there being potential for very fluid melts in =
a system containing Barium and Boron oxides. There are some moderately =
low freezing point mixtures which may form on cooling to crystallisation =
and no doubt the glass which can form has an equally low transition =
temperature. This problem is exaggerated by the presence of Silica, =
which is unavoidable. I have it on record that the solidification =
temperature has the potential to be as low as 450 deg Celsius. This =
would no doubt depend on composition and Thermal History during cooling.
Engagement with Glazes is a fascinating adventure.
Best regards,
Ivor.
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