Dorothy Kelba on sun 12 nov 00
For the person looking for a clear glaze for a brown clay body,
I tested Patti's Crystal Clear( ^5-7) when I was looking for a glaze to =
use on coloured clays. I needed a glaze that was clear and would keep =
the colours reasonably true. Since then I have used it on Seattle =
Pottery's Vaschon Orange clay and with B-Mix (brushwork with Mason =
stains over and under the glaze). It crazed + + on Seattle's white =
paperclay.
It does contain gerstley borate so will need to be revised to frits or =
one of the substitutes that are now on the market. I was planning to =
test it using one of the Boraq formulas but it will probably be some =
time yet before I get around to it.
The orange/red clay body goes brown under this glaze and all the stains =
I used have worked well. It seems to be very stable with very little =
flow. It can go milky white where thick but I mix it really quite thin =
but a thin glaze coat provides a smooth glossy surface at ^5-6 in an =
electric kiln.
Here's the original recipe which I found in the clayart glaze database =
on the CeramicsWeb as well as the revised version I have been using. I =
don't remember why I made the revision, my notes are sadly lacking.=20
Patti's Crystal Clear ^5-7
Gerstley Borate 21
Whiting 8
Nepheline Syenite 30
Kaolin 10
Flint 31
=20
Patti's Clear Revised ^5-6
Gerstley Borate 21.8
Wollastonite 9.6
Nepheline Syenite 31.0
EPK 10.4=20
Flint 27.2
Dorothy Kelba
dkelba@telus.net
Vancouver, B.C.
Canada
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