david henion on sat 22 jul 00
By pounding a lump of mica shist with a heavy hammer
on my driveway I have been able to collect a fair
amount of mica fine enough to pass through a fine
sive. I have used this powered mica as a part of my
cone 10 porcelain clay body. I have mixed it into a
clear cone 10 glaze and passed it through a 200 sive
and made an interesting glaze and I have rolled some
of the mica on to the surface of a slab of porcelain
and fired to cone 10.
I wound up with a shiny goldish surface though a
little on the rough side surface wise. It's lots of
fun. I would guess the stuff melts by itself in the
cone 9-10 range, have fun and good luck.
David W. Henion
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Martin Howard on mon 24 jul 00
In preparing for an East Anglian Potters Association camp this August, where
they will be creating a Roman kiln and firing Roman style pots, I read a
little about their methods.
Apparently they often used mica dust as a powder just sprinkled around the
upper parts of parts, so that it highlighted the shape.
It doesn't look as if they included mica dust within the terra sigilata, but
just used it as a final addition before firing, a dry glaze by itself it you
like.
Martin Howard
Webb's Cottage Pottery
Woolpits Road, Great Saling
BRAINTREE, Essex CM7 5DZ
England
martin@webbscottage.co.uk
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