Grimmer on tue 6 jan 98
Joyce Lee wrote:
Snip
> An area that probably should seem simple but hangs me up and
> which research hasn't cleared up is:
>
> 1) What is a feldspathic limestone clear? I'm reading Mimi Obstler's
> "Out of the Earth into the Fire" which says a lot about limestone,
> whiting, calcium carbonate etc but I'm missing something here. Probably
> because the 1234 Clear whizzed right past me. I know it must refer to
> percentages, probably 25, 25, 25, 25...but of what? Feldspar?
> Limestone? and? and? Ignorance is not bliss.
>
Snap
Joyce,
1234 is an old Bernard Leach glaze which he lists as a cone 8 limestone
glaze in his "Potter's Book." It's got a pretty wide range, though, and
crazes on most clays anyway.
Leach 1234
10 china clay
20 Limestone
30 Quartz
40 Feldspar
Leach is probably using whiting (Calcium carbonate) for his limestone,
but Dolomite is also known as limestone, too. Dolomite sources
considerable magnesia, so that's probably not what he used.
Oh, hey! Try doing a base layer of temmoku or kaki, then a wax resist
design, then the other glaze over the top. You can even pour hot wax like
a glaze!
steve grimmer
marion illinois
60 and foggy at 9pm...
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